TY  - BOOK
AU  - Lyusternik,L.A.
TI  - Shorter paths variational problems
T2  - Popular Lectures in Mathematics; 13
AV  - MATH QA315.L98 
PY  - 1964///
CY  - Oxford
PB  - Pergamon Press
KW  - Variational inequalities (mathematics)
ER  -