00278nam a2200109Ia 4500082002000000100002000020245005500040260003600095300002700131500000500158700000500163  a515.35bF911.PD  aFriedman, Avner  aPartial differential equations of parabolic typeb  aNew JerseybPrentice-Hallc1964  axiv, 347p. Bibl. Index  a  a