@article{10_1017_fmp_2023_6,
     author = {Christopher Hacon and Jakub Witaszek},
     title = {On the relative minimal model program for fourfolds in positive and mixed characteristic},
     journal = {Forum of Mathematics, Pi},
     publisher = {mathdoc},
     volume = {11},
     year = {2023},
     doi = {10.1017/fmp.2023.6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/fmp.2023.6/}
}