APA (7th ed.) Citation

Foerster, H., & Witsch, K. (1981). On efficient multigrid software for elliptic problems on rectangular domains. SFB 72.

Chicago Style (17th ed.) Citation

Foerster, Hartmut, and Kristian Witsch. On Efficient Multigrid Software for Elliptic Problems on Rectangular Domains. Bonn: SFB 72, 1981.

MLA (9th ed.) Citation

Foerster, Hartmut, and Kristian Witsch. On Efficient Multigrid Software for Elliptic Problems on Rectangular Domains. SFB 72, 1981.