Publisher
Springer International Publishing
Reference2 articles.
1. Do Carmo, Manfredo P., Differential Geometry of Curves and Surfaces (2nd. Ed.), Dover, New York, 2016.
2. Schmidt, Erhard, ber das isoperimetrische Problem im Raum von n Dimensionen, Math. Z. 44, no. 1 (1939), 689–788.