diff --git a/src/calibre/ebooks/metadata/book/base.py b/src/calibre/ebooks/metadata/book/base.py
index 53d336a23d..286bcee9d0 100644
--- a/src/calibre/ebooks/metadata/book/base.py
+++ b/src/calibre/ebooks/metadata/book/base.py
@@ -710,7 +710,8 @@ class Metadata(object):
             fmt('Title sort', self.title_sort)
         if self.authors:
             fmt('Author(s)',  authors_to_string(self.authors) + \
-               ((' [' + self.author_sort + ']') if self.author_sort else ''))
+               ((' [' + self.author_sort + ']') 
+                if self.author_sort and self.author_sort != _('Unknown') else ''))
         if self.publisher:
             fmt('Publisher', self.publisher)
         if getattr(self, 'book_producer', False):
diff --git a/src/calibre/ebooks/metadata/sources/ozon.py b/src/calibre/ebooks/metadata/sources/ozon.py
index fa9951c40c..ecec13662f 100644
--- a/src/calibre/ebooks/metadata/sources/ozon.py
+++ b/src/calibre/ebooks/metadata/sources/ozon.py
@@ -11,7 +11,7 @@ import datetime
 from urllib import quote_plus
 from Queue import Queue, Empty
 from lxml import etree, html
-from calibre import as_unicode
+from calibre import prints, as_unicode
 
 from calibre.ebooks.chardet import xml_to_unicode
 
@@ -54,7 +54,8 @@ class Ozon(Source):
     def create_query(self, log, title=None, authors=None, identifiers={}): # {{{
         # div_book -> search only books, ebooks and audio books
         search_url = self.ozon_url + '/webservice/webservice.asmx/SearchWebService?searchContext=div_book&searchText='
-
+        
+        # for ozon.ru search we have to format ISBN with '-'
         isbn = _format_isbn(log, identifiers.get('isbn', None))
         # TODO: format isbn!
         qItems = set([isbn, title])
@@ -64,7 +65,7 @@ class Ozon(Source):
         qItems.discard('')
         qItems = map(_quoteString, qItems)
 
-        q = ' '.join(qItems).strip()
+        q = u' '.join(qItems).strip()
         log.info(u'search string: ' + q)
 
         if isinstance(q, unicode):
@@ -78,13 +79,13 @@ class Ozon(Source):
         return search_url
     # }}}
 
-    def identify(self, log, result_queue, abort, title=None, authors=None, # {{{
-            identifiers={}, timeout=30):
+    def identify(self, log, result_queue, abort, title=None, authors=None, 
+            identifiers={}, timeout=30): # {{{
         if not self.is_configured():
             return
         query = self.create_query(log, title=title, authors=authors, identifiers=identifiers)
         if not query:
-            err = 'Insufficient metadata to construct query'
+            err = u'Insufficient metadata to construct query'
             log.error(err)
             return err
 
@@ -109,7 +110,7 @@ class Ozon(Source):
     # }}}
 
     def get_metadata(self, log, entries, title, authors, identifiers): # {{{
-        # some book titles have extra charactes like this
+        # some book titles have extra characters like this
         # TODO: make a twick
         reRemoveFromTitle = None 
         #reRemoveFromTitle = re.compile(r'[?!:.,;+-/&%"\'=]')
@@ -160,7 +161,7 @@ class Ozon(Source):
             mi.source_relevance = i
             if ensure_metadata_match(mi):
                 metadata.append(mi)
-                # log.debug(u'added metadata %s %s. '%(mi.title, mi.authors))
+                #log.debug(u'added metadata %s %s.'%(mi.title,  mi.authors))
             else:
                 log.debug(u'skipped metadata %s %s. (does not match the query)'%(mi.title, mi.authors))
         return metadata
@@ -285,12 +286,12 @@ class Ozon(Source):
         url = self.get_book_url(metadata.get_identifiers())[2]
 
         raw = self.browser.open_novisit(url, timeout=timeout).read()
-        doc = html.fromstring(raw)
+        doc = html.fromstring(xml_to_unicode(raw, verbose=True)[0])
 
         xpt_prod_det_at = u'string(//div[contains(@class, "product-detail")]//*[contains(normalize-space(text()), "%s")]/a[1]/@title)'
         xpt_prod_det_tx = u'substring-after(//div[contains(@class, "product-detail")]//text()[contains(., "%s")], ":")'
 
-        # series
+        # series Серия/Серии
         xpt = xpt_prod_det_at % u'Сери'
         # % u'Серия:'
         series = doc.xpath(xpt)
@@ -300,7 +301,7 @@ class Ozon(Source):
         xpt = u'normalize-space(substring-after(//meta[@name="description"]/@content, "ISBN"))'
         isbn_str = doc.xpath(xpt)
         if isbn_str:
-            all_isbns = [check_isbn(isbn) for isbn in self.isbnRegex.findall(isbn_str) if check_isbn(isbn)]
+            all_isbns = [check_isbn(isbn) for isbn in self.isbnRegex.findall(isbn_str) if _verifyISBNIntegrity(log, isbn)]
             if all_isbns:
                 metadata.all_isbns = all_isbns
                 metadata.isbn = all_isbns[0]
@@ -333,10 +334,10 @@ class Ozon(Source):
         xpt = u'//table[@id="detail_description"]//tr/td'
         comment_elem = doc.xpath(xpt)
         if comment_elem:
-            comments = unicode(etree.tostring(comment_elem[0]))
+            comments = unicode(etree.tostring(comment_elem[0], encoding=unicode))
             if comments:
                 # cleanup root tag, TODO: remove tags like object/embeded
-                comments = re.sub(r'\A.*?<td.*?>|</td>.*\Z', u'', comments.strip(), re.MULTILINE).strip()
+                comments = re.sub(ur'\A.*?<td.*?>|</td>.*\Z', u'', comments.strip(), re.MULTILINE).strip()
                 if comments and (not metadata.comments or len(comments) > len(metadata.comments)):
                     metadata.comments = comments
                 else:
@@ -345,8 +346,16 @@ class Ozon(Source):
             log.debug('No book description found in HTML')
     # }}}
 
-def _quoteString(str): # {{{
-    return '"' + str + '"' if str and str.find(' ') != -1 else str
+def _quoteString(strToQuote): # {{{
+    return '"' + strToQuote + '"' if strToQuote and strToQuote.find(' ') != -1 else strToQuote
+# }}}
+
+def _verifyISBNIntegrity(log, isbn): # {{{
+    # Online ISBN-Check http://www.isbn-check.de/
+    res = check_isbn(isbn)
+    if not res:
+        log.error(u'ISBN integrity check failed for "%s"'%isbn)
+    return res is not None
 # }}}
 
 # TODO: make customizable
@@ -438,7 +447,7 @@ def _normalizeAuthorNameWithInitials(name): # {{{
     return res
 # }}}
 
-def toPubdate(log, yearAsString):
+def toPubdate(log, yearAsString): # {{{
     res = None
     if yearAsString:
         try:
@@ -448,7 +457,11 @@ def toPubdate(log, yearAsString):
         except:
             log.error('cannot parse to date %s'%yearAsString)
     return res
+# }}}
 
+def _listToUnicodePrintStr(lst): # {{{
+    return u'[' + u', '.join(unicode(x) for x in lst) + u']'
+# }}}
 
 if __name__ == '__main__': # tests {{{
     # To run these test use: calibre-debug -e src/calibre/ebooks/metadata/sources/ozon.py
diff --git a/src/calibre/gui2/store/stores/ozon_ru_plugin.py b/src/calibre/gui2/store/stores/ozon_ru_plugin.py
index 3934ebbbb3..5d977700c8 100644
--- a/src/calibre/gui2/store/stores/ozon_ru_plugin.py
+++ b/src/calibre/gui2/store/stores/ozon_ru_plugin.py
@@ -77,7 +77,8 @@ class OzonRUStore(BasicStoreConfig, StorePlugin):
 
         result = False
         with closing(br.open(url, timeout=timeout)) as f:
-            doc = html.fromstring(f.read())
+            raw = xml_to_unicode(f.read(), verbose=True)[0]
+            doc = html.fromstring(raw)
             
             # example where we are going to find formats
             # <div class="l">
@@ -88,7 +89,7 @@ class OzonRUStore(BasicStoreConfig, StorePlugin):
             # <div class="l">
             #     <p>.epub, .fb2.zip, .pdf</p>
             # </div>
-            xpt = u'normalize-space(//div[contains(@class, "product-detail")]//*[contains(normalize-space(text()), "Доступ")]/ancestor-or-self::div[1]/following-sibling::div[1]/*[1])'
+            xpt = u'normalize-space(//div[contains(@id, "saleBlock")]//*[contains(normalize-space(text()), "Доступ")]/ancestor-or-self::div[1]/following-sibling::div[1]/*[1])'
             formats = doc.xpath(xpt)
             if formats:
                 result = True
diff --git a/src/calibre/translations/ru.po b/src/calibre/translations/ru.po
index c515e6213e..89f44b0b6f 100644
--- a/src/calibre/translations/ru.po
+++ b/src/calibre/translations/ru.po
@@ -12539,7 +12539,7 @@ msgstr "За&грузить метаданные"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single.py:226
 msgid "Configure download metadata"
-msgstr ""
+msgstr "Настроить загрузку метаданных"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single.py:230
 msgid "Change how calibre downloads metadata"
@@ -12595,7 +12595,7 @@ msgstr "&Пользовательские метаданные"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single.py:788
 msgid "&Comments"
-msgstr "Комментарии"
+msgstr "&Комментарии"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single.py:854
 msgid "Basic metadata"
@@ -12603,11 +12603,11 @@ msgstr "Основные метаданные"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single_download.py:133
 msgid "Has cover"
-msgstr "Есть обложка"
+msgstr "Обложка"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single_download.py:133
 msgid "Has summary"
-msgstr ""
+msgstr "Аннотация"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single_download.py:190
 msgid ""
@@ -12619,7 +12619,7 @@ msgstr ""
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single_download.py:268
 msgid "See at"
-msgstr ""
+msgstr "Посмотреть на"
 
 #: /home/kovid/work/calibre/src/calibre/gui2/metadata/single_download.py:403
 msgid "calibre is downloading metadata from: "