Differential geometry of curves and surfaces :
Toponogov, Victor Andreevich, 1930-
Differential geometry of curves and surfaces : a concise guide / Victor Andreevich Toponogov ; with the editorial assistance of Vladimir Y. Rovenski. - Birkh
Differential geometry of curves and surfaces : a concise guide / Victor Andreevich Toponogov ; with the editorial assistance of Vladimir Y. Rovenski. - Birkh