@misc {SC.8.Langtangen.1986,
	title = {An Element by Element Preconditioner for Iterative Equation Solvers},
	howpublished = {Talk at the 2nd International Conference on Finite Element Methods in Water Resources, Lisboa, Portugal},
	year = {1986},
	note = {Presented by A. Tveito},
	author = {Hans Petter {Langtangen} and Rusten, T. and Tveito, Aslak and S. {\O} {Wille}}
}
@inproceedings {SC.6.Langtangen.1986,
	title = {An Element by Element Preconditioner for Iterative Equation Solvers},
	journal = {Proceedings of the 2nd international conference on Finite Element Methods in Water Resources, Lisboa, Portugal},
	year = {1986},
	type = {1},
	author = {Hans Petter {Langtangen} and Rusten, T. and Tveito, Aslak and S. {\O} {Wille}},
	editor = {Brebbia et {al.}}
}
