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.2:t.30 (1870):
http://www.biodiversitylibrary.org/item/28494 Article/Chapter Title: Sur la détermination de l'aire de l'ellipsoïde Author(s): Eugène CatalanPage(s): Page 97, Page 98, Page 99, Page 100, Page 101, Page 102, Page 103, Page 104
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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