@misc{10147, author = {Hans Langtangen and T. Rusten and Aslak Tveito and S. Wille}, title = {An Element by Element Preconditioner for Iterative Equation Solvers}, year = {1986}, journal = {Proceedings of the 2nd international conference on Finite Element Methods in Water Resources, Lisboa, Portugal}, editor = {Brebbia al.}, }