Sven Beuchler, Veronika Pillwein, Joachim Schöberl and Sabine Zaglmayr Sparsity optimized high order finite element functions on simplices In Numerical and symbolic scientific computing, Texts Monogr. Symbol. Comput.
page 21--44.
Publisher: SpringerWienNewYork, Vienna
2012 http://dx.doi.org/10.1007/978-3-7091-0794-2_2