@article{GDZPPN002334259, title = {Perturbation by differences of unbounded potentials.}, journal = {Mathematische Annalen}, volume = {287}, year = {1990}, pages = {553-570}, zbl = {0685.31005}, url = {http://dml.mathdoc.fr/item/GDZPPN002334259} }
Hansen, W.; Ma, Z. Perturbation by differences of unbounded potentials.. Mathematische Annalen, Tome 287 (1990) pp. 553-570. http://gdmltest.u-ga.fr/item/GDZPPN002334259/