TY  - BOOK
AU  - Bonola,Roberto
AU  - B�olyai,J�anos
AU  - Lobachevski�i,N.I.
TI  - Non-Euclidean geometry: a critical and historical study of its development
AV  - QA685 .B83 1955
U1  - 513.8 
PY  - 1955///]
CY  - [New York]
PB  - Dover Publications
KW  - Geometry, Hyperbolic
N1  - Bibliographical footnotes
ER  -