TY  - BOOK
AU  - Lyusternik,L.A.
AU  - Collins,P.
AU  - Brown,Robert B.
TI  - Shortest paths variational problems
U1  - 517.4 
PY  - 1964///
CY  - Oxford
PB  - Pergamon Press
KW  - Calculus of variations
KW  - Curves on surfaces
KW  - Geodesis (Mathematics)
N1  - Translation of: Kratchaischie linii
ER  -