000
00291nam a2200109 4500
008
160616s 000 0
245
_a
Projective differential geometry of curves and ruled surfaces
100
_a
Wilczynski, E.J
500
_a
B6:7 K1
942
_c
BK
_2
BK3306
080
_a
517.144 WIL
999
_c
3306
_d
3306