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@article{MAN_1908__65_158364, author = {M. Mason}, title = {On the linear differential equation of hyperbolic type}, journal = {Mathematische Annalen}, pages = {570--576}, publisher = {mathdoc}, volume = {65}, year = {1908}, zbl = {39.0427.01}, url = {http://geodesic.mathdoc.fr/item/MAN_1908__65_158364/} }
M. Mason. On the linear differential equation of hyperbolic type. Mathematische Annalen, Tome 65 (1908), pp. 570-576. http://geodesic.mathdoc.fr/item/MAN_1908__65_158364/