@article{GDZPPN002400693, title = {The ...-Fredholm Property for Oblique Derivative Problems.}, journal = {Mathematische Zeitschrift}, volume = {99}, year = {1967}, pages = {103-122}, zbl = {0148.35501}, url = {http://dml.mathdoc.fr/item/GDZPPN002400693} }
Borrelli, Robert L. The ...-Fredholm Property for Oblique Derivative Problems.. Mathematische Zeitschrift, Tome 99 (1967) pp. 103-122. http://gdmltest.u-ga.fr/item/GDZPPN002400693/