@article{00130468, title = {Finite eigenfunction approximations for continuous spectrum operators.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {16}, year = {1993}, pages = {1-22}, doi = {10.1155/S0161171293000018}, zbl = {0785.47020}, language = {en}, url = {http://dml.mathdoc.fr/item/00130468} }
Kauffman, Robert M. Finite eigenfunction approximations for continuous spectrum operators.. International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993) pp. 1-22. doi : 10.1155/S0161171293000018. http://gdmltest.u-ga.fr/item/00130468/