found: Der Abbatiat Ademars von Saint-Martial de Limoges (1063-1114), 1989:title page (Andreas Sohn) page vii (submitted this work as his doctoral thesis to the Universität Münster in 1988)
found: Deutsche Prokuratoren an der römischen Kurie in der Frührenaissance (1431-1474), 1997:title page (Andreas Sohn) preliminary page (submitted this work as his Habilitationsschrift to the Universität Münster in 1995)
found: Deutsche Nationalbibliothek online catalog, viewed October 9, 2017(authorized access point: Sohn, Andreas; other data in authority record: Prof. Dr.; born 1959; has taught Medieval history at the Université de Paris XIII since 2001) - http://d-nb.info/gnd/143578820
found: German Wikipedia, viewed October 9, 2017(Andreas Sohn; German historian; born March 15, 1959, in Dortmund; studied history and Catholic theology in Münster and Poitiers; received his Habilitation in 1995 at the Universität Münster)