Shortest paths :
Lusternik, Lazar A, 1899-
Shortest paths : variational problems / L. A. Lyusternik. - New York : Macmillan, 1964. - x, 102 p. : illus. ; 23 cm. - Survey of recent East European mathematical literature .
Open access.
6414145
Calculus of variations.
Curves on surfaces.
Shortest paths : variational problems / L. A. Lyusternik. - New York : Macmillan, 1964. - x, 102 p. : illus. ; 23 cm. - Survey of recent East European mathematical literature .
Open access.
6414145
Calculus of variations.
Curves on surfaces.