Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{KYB_1993__29_3_a4, author = {Liu, W. B. and Rubio, J. E.}, title = {A unified optimality condition for eigenvalue problems}, journal = {Kybernetika}, pages = {249--255}, publisher = {mathdoc}, volume = {29}, number = {3}, year = {1993}, mrnumber = {1231870}, zbl = {0790.49026}, language = {en}, url = {http://geodesic.mathdoc.fr/item/KYB_1993__29_3_a4/} }
Liu, W. B.; Rubio, J. E. A unified optimality condition for eigenvalue problems. Kybernetika, Tome 29 (1993) no. 3, pp. 249-255. http://geodesic.mathdoc.fr/item/KYB_1993__29_3_a4/