00341nam a22001097a 4500020001800000082001700018100002600035245008800061260005300149300002000202563000900222  a9789694171531  a515.353bRAN  aRana, Muhammad Afzal   aFinite difference methods for partial differential equations /cMuhammad Afzal Rana  aIslamabad :bHigher Education Commission,c2011.  a329p. ;c24 cm.  aPBK.