00475     2200169   4500001002100000008003900021035002000060245004700080100002000127260004500147300002300192020001800215084001800233082001200251650002800263990001400291INLIS000000000005788                                   N    a0010-0317005786  aLectures on partial differential equations  aPetrovsky, I.G.  aNew York :bDover publishing, Inc.c1991  ax, 245 hlm.c22 cm  a0 486 66902 5  a515 353 Pet l  a515 353  aDIFFERENTIAL EQUATIIONS  a110495412