@article{05028381, title = {Gantmacher--Kre\u\i n theorem for 2 nonnegative operators in spaces of functions.}, journal = {Abstract and Applied Analysis}, volume = {2006}, year = {2006}, doi = {10.1155/AAA/2006/48132}, zbl = {1130.47018}, language = {en}, url = {http://dml.mathdoc.fr/item/05028381} }
Kushel, O.Y.; Zabreiko, P.P. Gantmacher–Kreĭn theorem for 2 nonnegative operators in spaces of functions.. Abstract and Applied Analysis, Tome 2006 (2006) . doi : 10.1155/AAA/2006/48132. http://gdmltest.u-ga.fr/item/05028381/