@article{10_4007_annals_2017_186_1_1,
     author = {Lionel Levine and Wesley Pegden and Charles K. Smart},
     title = {The {Apollonian} structure of integer superharmonic matrices},
     journal = {Annals of mathematics},
     pages = {1--67},
     publisher = {mathdoc},
     volume = {186},
     number = {1},
     year = {2017},
     doi = {10.4007/annals.2017.186.1.1},
     mrnumber = {3664999},
     zbl = {06751217},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2017.186.1.1/}
}