On the Lines of Equidistance of a Family of Surfaces
Journal de Mathématiques Pures et Appliquées, Série 9, Tome 9 (1930), pp. 383-390. 
@article{JMPA_1930_9_9__383_0,
     author = {Weatherburn, C. E.},
     title = {On the {Lines} of {Equidistance} of a {Family} of {Surfaces}},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {383--390},
     publisher = {Gauthier-Villars},
     volume = {Ser. 9, 9},
     year = {1930},
     language = {en},
     url = {http://www.numdam.org/item/JMPA_1930_9_9__383_0/}
}
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EP  - 390
VL  - 9
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%J Journal de Mathématiques Pures et Appliquées
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%F JMPA_1930_9_9__383_0
Weatherburn, C. E. On the Lines of Equidistance of a Family of Surfaces. Journal de Mathématiques Pures et Appliquées, Série 9, Tome 9 (1930), pp. 383-390. http://www.numdam.org/item/JMPA_1930_9_9__383_0/