Entropy Stable p-Nonconforming Discretizations with the Summation-by-Parts Property for the Compressible Euler equations. - David C. Del Rey Fernández; Mark H. Carpenter; Lisandro Dalcín; L. Fredrich; Diego Rojas; Andrew R. Winters; Gregor J. Gassner; Stefano Zampini; Matteo Parsani (CoRR, 2019)