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.21 (1891):
http://www.biodiversitylibrary.org/item/110934 Article/Chapter Title: Rapport sur un calcul purement géométrique des distances...(*) par M. ThiryAuthor(s): Eugène Catalan
Page(s): Page 411, Page 412, Page 413, Page 414, Page 415, Page 416
Contributed by: Missouri Botanical Garden, Peter H. Raven Library Sponsored by: Missouri Botanical Garden
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