@article{01086037, title = {Relative boundedness and compactness theory for second-order differential operators.}, journal = {Journal of Inequalities and Applications [electronic only]}, volume = {1}, year = {1997}, pages = {375-400}, doi = {10.1155/S1025583497000271}, zbl = {0891.34062}, language = {en}, url = {http://dml.mathdoc.fr/item/01086037} }
Anderson, Terry G.; Hinton, Don B. Relative boundedness and compactness theory for second-order differential operators.. Journal of Inequalities and Applications [electronic only], Tome 1 (1997) pp. 375-400. doi : 10.1155/S1025583497000271. http://gdmltest.u-ga.fr/item/01086037/