@misc{12076, 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 = {Talk at the 2nd International Conference on Finite Element Methods in Water Resources, Lisboa, Portugal}, note = {Presented by A. Tveito}, }