Biographisch-Bibliographisches Kirchenlexikon online, July 22, 2011 (Duchesne, Louis Marie Olivier; Catholic church historian; b. Sept. 13, 1843 in Saint-Servan-sur-Mer; d. Apr. 21, 1922 in Rome)
De codicibus mss. Graecis Pii II, 1880 t.p. (L. Duchesne, Gallicae in Urbe Scholae olim socius)