TY  - BOOK
AU  - Lobachevski,Nicholas
AU  - Halsted,George Bruce
ED  - Asutosh Collection (National Library, India)
TI  - Geometrical researces on the theory of parallels
U1  - 513.84 
PY  - 1914///
CY  - Chicago
PB  - Open Court Pub.
KW  - Differential topology
KW  - Parallels (Geometry)
ER  -