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@article{JRAM_1882__93_148514, author = {Thomas Craig}, title = {On the {Parallel} {Surface} to the {Ellipsoid.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {251--270}, publisher = {mathdoc}, volume = {93}, year = {1882}, zbl = {14.0694.01}, url = {http://geodesic.mathdoc.fr/item/JRAM_1882__93_148514/} }
Thomas Craig. On the Parallel Surface to the Ellipsoid.. Journal für die reine und angewandte Mathematik, Tome 93 (1882), pp. 251-270. http://geodesic.mathdoc.fr/item/JRAM_1882__93_148514/