00361nam a2200121Ia 4500082002000000100001300020245008800033260003600121300002900157490004300186500000500229700000500234  a515.72bP348.SL  aPazy, A.  aSemigroups of linear operators and applications to partial differential equationsb  aNew YorkbSpringer-Verlagc1983  aviii, 279p. Index, Bibl.  aApplied Mathematical Sciences v v. 44  a  a