@article{05304378, title = {A note on comprehensive backward biorthogonalization.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2006}, year = {2006}, doi = {10.1155/IJMMS/2006/87392}, zbl = {1149.42022}, language = {en}, url = {http://dml.mathdoc.fr/item/05304378} }
Ruch, David K. A note on comprehensive backward biorthogonalization.. International Journal of Mathematics and Mathematical Sciences, Tome 2006 (2006) . doi : 10.1155/IJMMS/2006/87392. http://gdmltest.u-ga.fr/item/05304378/