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@article{JRAM_1929__160_149677, author = {C.E. Weatherburn}, title = {On oblique {Trajectories} of a {Family} of {Curves} on a {Surface.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {61--66}, publisher = {mathdoc}, volume = {160}, year = {1929}, zbl = {55.0399.04}, url = {http://geodesic.mathdoc.fr/item/JRAM_1929__160_149677/} }
C.E. Weatherburn. On oblique Trajectories of a Family of Curves on a Surface.. Journal für die reine und angewandte Mathematik, Tome 160 (1929), pp. 61-66. http://geodesic.mathdoc.fr/item/JRAM_1929__160_149677/