Gans, David
An introduction to non-euclidean geometry Gans, David - New York Academic Press 1973 - 274p.
0122748506
Geometry, Non-Euclidean
516.9 / GAI
An introduction to non-euclidean geometry Gans, David - New York Academic Press 1973 - 274p.
0122748506
Geometry, Non-Euclidean
516.9 / GAI