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@article{MAN_1968__178_161744, author = {J. PERSSON}, title = {New {Proofs} and {Generalizations} of {Two} {Theorems} by {Lednev} for {Goursat} {Problems.}}, journal = {Mathematische Annalen}, pages = {184--208}, publisher = {mathdoc}, volume = {178}, year = {1968}, zbl = {0159.14701}, url = {http://geodesic.mathdoc.fr/item/MAN_1968__178_161744/} }
J. PERSSON. New Proofs and Generalizations of Two Theorems by Lednev for Goursat Problems.. Mathematische Annalen, Tome 178 (1968), pp. 184-208. http://geodesic.mathdoc.fr/item/MAN_1968__178_161744/