Bers, L., John, F. 1., Schechter, M., Garding, L., & Milgram, A. N. (1964). Partial differential equations. New York: Interscience Publishers.

Bers, Lipman, Fritz 1910-1994 John, Martin Schechter, Lars Garding, and A. N. Milgram. Partial Differential Equations. New York: Interscience Publishers, 1964.

Bers, Lipman, et al. Partial Differential Equations. New York: Interscience Publishers, 1964.