Selected publications
• Projective differential geometry of curves and ruled surfaces, Leipzig, Teubner 1906 • Projective differential geometry of curved surfaces, Parts I–V, Transactions American Mathematical Society • vol. 8, 1907, Part I, pp. 223–260 • vol. 9, 1908, Part II, pp. 79–120 ; Part III, pp. 293–315 • vol. 10, 1909, Part IV, pp. 176–200 ; Part V, pp. 279–296 ==References==