Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MOMA_1975__80_177712, author = {Allan M. Krall}, title = {On the {Solutions} of (ry')' + qy = f.}, journal = {Monatshefte f\"ur Mathematik}, pages = {115--118}, publisher = {mathdoc}, volume = {80}, year = {1975}, zbl = {0323.34029}, url = {http://geodesic.mathdoc.fr/item/MOMA_1975__80_177712/} }
Allan M. Krall. On the Solutions of (ry')' + qy = f.. Monatshefte für Mathematik, Tome 80 (1975), pp. 115-118. http://geodesic.mathdoc.fr/item/MOMA_1975__80_177712/