Cita APA (7th ed.)

Kauffmann, R. M., Read, T. T., & Zettl, A. (1977). The deficiency index problem for powers of ordinary differential expressions. Springer-Verlag.

Cita Chicago (17th ed.)

Kauffmann, Robert M., Thomas T. Read, i Anton Zettl. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. Berlín: Springer-Verlag, 1977.

Cita MLA (9th ed.)

Kauffmann, Robert M., et al. The Deficiency Index Problem for Powers of Ordinary Differential Expressions. Springer-Verlag, 1977.