Traub, Gilbert (1984). The Development of the Mathematical Analysis of Curve Length from Archimedes to Lebesgue (Doctoral dissertation). New York University. p. 470. MR2633321. ProQuest303305072.
Archibald, Thomas (2002). "Charles Hermite and German mathematics in France". In Parshall, Karen Hunger; Rice, Adrian C. (eds.). Mathematics unbound: the evolution of an international mathematical research community, 1800–1945. Papers from the International Symposium held at the University of Virginia, Charlottesville, VA, May 27–29, 1999. History of Mathematics. Vol. 23. Providence, Rhode Island: American Mathematical Society. pp. 123–137. MR1907173. See footnote 60, p. 135.
Archibald, Thomas (2002). "Charles Hermite and German mathematics in France". In Parshall, Karen Hunger; Rice, Adrian C. (eds.). Mathematics unbound: the evolution of an international mathematical research community, 1800–1945. Papers from the International Symposium held at the University of Virginia, Charlottesville, VA, May 27–29, 1999. History of Mathematics. Vol. 23. Providence, Rhode Island: American Mathematical Society. pp. 123–137. MR1907173. See footnote 60, p. 135.
Atneosen, Gail H. (March 1972). "The Schwarz paradox: An interesting problem for the first-year calculus student". The Mathematics Teacher. 65 (3): 281–284. doi:10.5951/MT.65.3.0281. JSTOR27958821.
Atneosen, Gail H. (March 1972). "The Schwarz paradox: An interesting problem for the first-year calculus student". The Mathematics Teacher. 65 (3): 281–284. doi:10.5951/MT.65.3.0281. JSTOR27958821.
Traub, Gilbert (1984). The Development of the Mathematical Analysis of Curve Length from Archimedes to Lebesgue (Doctoral dissertation). New York University. p. 470. MR2633321. ProQuest303305072.