Étude des Élassoïdes ou Surfaces A Courbure Moyenne Nulle, by Ribaucour 29805 [Full author: Albert Ribaucour] [Language: French] [Link: http://www.gutenberg.org/2/9/8/0/29805 ] [Files: 29805-8.txt] Thanks to Laura Wisewell, Andrew D. Hwang, and the Online Distributed Proofreading Team at http://www.pgdp.net (The original copy of this book was generously made available for scanning by the Department of Mathematics at the University of Glasgow.) David