@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.},
}