Peter Bastian, Mirco Altenbernd, Nils-Arne Dreier, Christian Engwer, Jorrit Fahlke, René Fritze, Markus Geveler, Dominik Göddeke, Oleg Iliev, Olaf Ippisch, Jan Mohring, Steffen Müthing, Mario Ohlberger, Dirk Ribbrock, Nikolay Shegunov, Stefan Turek. Exa-Dune - Flexible PDE Solvers, Numerical Methods and Applications. In Hans-Joachim Bungartz, Severin Reiz, Benjamin Uekermann, Philipp Neumann, Wolfgang E. Nagel, editors, Software for Exascale Computing - SPPEXA 2016-2019. Volume 136 of Lecture Notes in Computational Science and Engineering, pages 225-269, Springer, 2020. [doi]