APA

Kauffman R. M., Read T. T., Zettl A. & Read T. T. (1977). The deficiency index problem for powers of ordinary differential expressions. Berlin: Springer.

Chicago

Kauffman Robert M, Read Thomas Thornton, Zettl Anton and Read Thomas Thornton. 1977. The deficiency index problem for powers of ordinary differential expressions. Berlin: Springer.

Harvard

Kauffman R. M., Read T. T., Zettl A. and Read T. T. (1977). The deficiency index problem for powers of ordinary differential expressions. Berlin: Springer.

MLA

Kauffman Robert M, Read Thomas Thornton, Zettl Anton and Read Thomas Thornton. The deficiency index problem for powers of ordinary differential expressions. Berlin: Springer. 1977.