APA (7th ed.) Citation

Butzer, P. L. (1967). Semigroups of operators and approximation.

Chicago Style (17th ed.) Citation

Butzer, Paul L. Semigroups of Operators and Approximation. 1967.

MLA (9th ed.) Citation

Butzer, Paul L. Semigroups of Operators and Approximation. 1967.

Warning: These citations may not always be 100% accurate.