000 00449nam a2200181 4500
020 _a
_c
082 _a515.35 ELS-D
100 _aElsgolts, L; Yankovsky, George, Tr.
245 _aDifferential equations and the calculus of variations
250 _a
260 _aMir Publishers, Moscow
_c1970
300 _a440
490 _a
500 _a
590 _arvr
_b
_c
650 _aDifferential equations; Analysis; Mathematics
942 _cBK
999 _c476195
_d476195