Projective Differential Geometry of Curves and Surfaces
1933 ◽
Vol 39
(3)
◽
pp. 181-183
1999 ◽
Vol 11
(2)
◽
pp. 117-128
◽
2000 ◽
Vol 54
(1)
◽
pp. 183-215
◽
1935 ◽
Vol 41
(4)
◽
pp. 273-276