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@article{JRAM_1883__94_148528, author = {Thomas Craig}, title = {Note on {Parallel} {Surfaces.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {162--170}, publisher = {mathdoc}, volume = {94}, year = {1883}, zbl = {15.0733.01}, url = {http://geodesic.mathdoc.fr/item/JRAM_1883__94_148528/} }
Thomas Craig. Note on Parallel Surfaces.. Journal für die reine und angewandte Mathematik, Tome 94 (1883), pp. 162-170. http://geodesic.mathdoc.fr/item/JRAM_1883__94_148528/