Pogorelov, A.V..
A Study of surfaces in an elliptic space / - 1st ed / - Delhi-6 : Hindustan Publishing Corporation , 1983 - p.94 :
Mathematics
B6M3 / K4;1
A Study of surfaces in an elliptic space / - 1st ed / - Delhi-6 : Hindustan Publishing Corporation , 1983 - p.94 :
Mathematics
B6M3 / K4;1