MLA

Kehrein, Stefan, A Fujimori, and C Varma. The Flow Equation Approach to Many-particle Systems. Springer Berlin Heidelberg, 2006.

APA

Kehrein, S., Fujimori, A., & Varma, C. (2006). The Flow Equation Approach to Many-Particle Systems. Springer Berlin Heidelberg.

Chicago

Kehrein, Stefan, A Fujimori, and C Varma. The Flow Equation Approach to Many-Particle Systems. : Springer Berlin Heidelberg, 2006.