000 00295nam a2200121 4500
008 160616s 000 0
245 _aLectures on partial differential equations
100 _aPetrovsky, I.G
500 _aB334 J71
942 _cBK
_2BK643
080 _a517.95 PET
080 _a517.95 PET
999 _c643
_d643