.. !split Bibliography ============ .. [Ref1] **H. P. Langtangen**. Approximation of functions, `http://tinyurl.com/k3sdbuv/pub/approx `_. .. [Ref2] **M. G. Larson and F. Bengzon**. *The Finite Element Method: Theory, Implementation, and Applications*, *Texts in Computational Science and Engineering*, Springer, 2013. .. [Ref3] **D. Braess**. *Finite Elements: Theory, Fast Solvers, and Applications in Solid Mechanics*, third edition, Cambridge University Press, 2007. .. [Ref4] **S. Brenner and R. Scott**. *The Mathematical Theory of Finite Element Methods*, third edition, Springer, 2007. .. [Ref5] **C. Johnson**. *Numerical Solution of Partial Differential Equations by the Finite Element Method*, Dover, 2009. .. [Ref6] **K. Eriksson, D. Estep, P. Hansbo and C. Johnson**. *Computational Differential Equations*, second edition, Cambridge University Press, 1996. .. [Ref7] **A. Quarteroni and A. Valli**. *Numerical Approximation of Partial Differential Equations*, Springer, 1994.