000 00317nam a2200121Ia 4500
008 160710s1977 xx 000 0 und d
082 _a517.38 ELG
100 _aELGOLTS,L.
245 _aDIFERENTIAL EQUATIONS AND THE CALCULAS OF VARIATION
260 _aMOSCOW
_bMIRPUBLISHERS
_c1977
300 _a440
942 _2ddc
_cB
999 _c42476
_d42476