Transformations of surfaces applicable to a quadric
Journal de Mathématiques Pures et Appliquées, Série 8, Tome 4 (1921), pp. 37-66. 
@article{JMPA_1921_8_4__37_0,
     author = {Eisenhart, Luther Pfahler},
     title = {Transformations of surfaces applicable to a quadric},
     journal = {Journal de Math\'ematiques Pures et Appliqu\'ees},
     pages = {37--66},
     publisher = {Gauthier-Villars},
     volume = {Ser. 8, 4},
     year = {1921},
     language = {en},
     url = {http://archive.numdam.org/item/JMPA_1921_8_4__37_0/}
}
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Eisenhart, Luther Pfahler. Transformations of surfaces applicable to a quadric. Journal de Mathématiques Pures et Appliquées, Série 8, Tome 4 (1921), pp. 37-66. http://archive.numdam.org/item/JMPA_1921_8_4__37_0/