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@article{MZ_1972__125_171696, author = {Aiden Bruen and J. Chris Fisher}, title = {Arcs and {Ovals} in {Derivable} {Planes.}}, journal = {Mathematische Zeitschrift}, pages = {122--128}, publisher = {mathdoc}, volume = {125}, year = {1972}, zbl = {0231.50013}, url = {http://geodesic.mathdoc.fr/item/MZ_1972__125_171696/} }
Aiden Bruen; J. Chris Fisher. Arcs and Ovals in Derivable Planes.. Mathematische Zeitschrift, Tome 125 (1972), pp. 122-128. http://geodesic.mathdoc.fr/item/MZ_1972__125_171696/