Cornell University Library Historical Math Monographs
Chapter XII: Rectilinear congruences
First available in Project Euclid: 10 April 2015
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Eisenhart, Luther Pfahler. Chapter XII: Rectilinear congruences. A treatise on the differential geometry of curves and surfaces, 392--425, Ginn and Company, Boston, New York [etc.], 1909. https://projecteuclid.org/euclid.chmm/1428681967