Tveito, A., & Winther, R. (2005). Introduction to partial differential equations: A computational approach. Springer.

Tveito, Aslak, and Ragnar Winther. Introduction to Partial Differential Equations: A Computational Approach. Berlin: Springer, 2005.

Tveito, Aslak, and Ragnar Winther. Introduction to Partial Differential Equations: A Computational Approach. Springer, 2005.