00279nam a2200109 a 450000500170000002000150001708200210003210000200005324500350007326000390010830000220014720251203090945.0  a0852267223  a515.35,bDD, Pra  aPrasad, Phoolan  aPartial differential equations  aDelhibWiley Eastern Limitedc1987  axi, 252p., 22 cm.