01011nam a2200277 i 450099100081798970753620020507173955.0960626s1977 ||| ||| | eng b10761421-39ule_instLE01302777ExLDip.to Matematicaeng515.64AMS 34-XXAMS 49-01AMS 49-XXElsgolts, Lev Ernestovic346159Differential equations and the calculus of variations /L. Elsgolts ; translated from the russian by George YankovskyMoscow :MIR,1977440 p. ;23 cm.Calculus of variations.b1076142121-09-0628-06-02991000817989707536LE013 49-XX ELS11 (1977)12013000052182le013-E0.00-l- 02020.i1085669928-06-02Differential equations and the calculus of variations348859UNISALENTOle01301-01-96ma -engxx 01