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.13 (1887):
http://www.biodiversitylibrary.org/item/110091 Article/Chapter Title: Sur les lignes géodésiques des surfaces de révolutionAuthor(s): Eugène Catalan
Page(s): Page 425, Page 426, Page 427, Page 428, Page 429, Page 430, Page 431, Page 432
Contributed by: Missouri Botanical Garden, Peter H. Raven Library Sponsored by: Missouri Botanical Garden
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