00350nam a22001097a 4500040000900000082001700009100001700026110001900043245007700062260003200139650006900171  cNust  a515.353bTVE  aAslak Tveito  aRagnar Winther  aIntroduction to Partial Differential Equations: A Computational Approach  aNew York:bSpringer,c1998.  aIntroduction to Differential Equations: A Computational Approach