00353pam a2200145a 44500008004100000020000900041041001200050082000900062100002400071245004500095250000600140260004400146300000800190650000900198230515b1987    xxu||||| |||| 00| 0 eng d  aNULL  aENGLISH  aN.D.  a"Churchillv , Ruel"  aFoures Series Of Bounbary Value Problems  a0  aNULLbTata McGraw Hill Publishingc1987  a292  aNULL