189835
Reidel himself had been trained under an ex-Elsevier manager , M. D. Frank , who considered third generation Dutch publishers like Reidel to be the " grandchildren " of the German publishing company , Aka GmbH Akademische Verlagsgesellschaft ( academic publishing company ) of Leipzig , where Frank himself was trained .
 Leipzig
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leipzig