Cornell University Library Historical Math Monographs
Chapter VII: Quadrics. Ruled surfaces. Minimal surfaces
First available in Project Euclid: 10 April 2015
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Eisenhart, Luther Pfahler. Chapter VII: Quadrics. Ruled surfaces. Minimal surfaces. A treatise on the differential geometry of curves and surfaces, 226--269, Ginn and Company, Boston, New York [etc.], 1909. https://projecteuclid.org/euclid.chmm/1428681962