Stefano Berrone Davide Fassino Fabio Vicini 3D Adaptive VEM with stabilization-free a posteriori error bounds. 2024 abs/2407.17858 CoRR https://doi.org/10.48550/arXiv.2407.17858 db/journals/corr/corr2407.html#abs-2407-17858 streams/journals/corr