TY - JOUR T1 - The deal.II Library, Version 9.1 JF - Journal of Numerical Mathematics Y1 - 2019 A1 - Daniel Arndt A1 - Wolfgang Bangerth A1 - Thomas C. Clevenger A1 - Denis Davydov A1 - Marc Fehling A1 - Garcia-Sanchez, Daniel A1 - Harper, Graham A1 - Timo Heister A1 - Luca Heltai A1 - Martin Kronbichler A1 - Maguire Kynch, Ross A1 - Matthias Maier A1 - Jean-Paul Pelteret A1 - Bruno Turcksin A1 - David Wells ER - TY - JOUR T1 - The deal.II Library, Version 9.1 JF - Journal of Numerical Mathematics Y1 - 2019 A1 - Daniel Arndt A1 - Wolfgang Bangerth A1 - Thomas C. Clevenger A1 - Denis Davydov A1 - Marc Fehling A1 - Garcia-Sanchez, Daniel A1 - Harper, Graham A1 - Timo Heister A1 - Luca Heltai A1 - Martin Kronbichler A1 - Maguire Kynch, Ross A1 - Matthias Maier A1 - Jean-Paul Pelteret A1 - Bruno Turcksin A1 - David Wells AB - This paper provides an overview of the new features of the finite element library deal.II, version 9.1. ER -