http://www.biodiversitylibrary.org/
Bulletins de l'Académie royale des sciences, des lettres et
des beaux-arts de Belgique.
Bruxelles.
http://www.biodiversitylibrary.org/bibliography/5550
ser.3:t.4 (1882):
http://www.biodiversitylibrary.org/item/90110 Article/Chapter Title: Quelques théorèmes de géométrie élémentaire Author(s): Eugène CatalanPage(s): Page 322, Page 323, Page 324, Page 325, Page 326, Page 327, Page 328, Page 329, Page 330, Page 331, Page 332, Page 333
Contributed by: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Sponsored by: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
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