00328nam a2200121Ia 4500082002000000100002100020245005000041260003500091300002900126490004100155500000500196700000500201  a515.35bT812.BL  aTreves, Francois  aBasic linear partial differential equationsb  aNew YorkbAcademic Pressc1975  axvii, 470p. Index, Bibl.  aPure and Applied Mathematicsv v. 62  a  a