@article{10_1007_s10587_014_0148_z,
     author = {Liu, Junping and Wei, Changguo},
     title = {Unital extensions of $AF$-algebras by purely infinite simple algebras},
     journal = {Czechoslovak Mathematical Journal},
     pages = {989--1001},
     publisher = {mathdoc},
     volume = {64},
     number = {4},
     year = {2014},
     doi = {10.1007/s10587-014-0148-z},
     mrnumber = {3304793},
     zbl = {06433709},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-014-0148-z/}
}