@article{10_1007_s10587_014_0155_0,
     author = {Petrich, Mario},
     title = {Characterizing pure, cryptic and {Clifford} inverse semigroups},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1099--1112},
     publisher = {mathdoc},
     volume = {64},
     number = {4},
     year = {2014},
     doi = {10.1007/s10587-014-0155-0},
     mrnumber = {3304800},
     zbl = {06433716},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-014-0155-0/}
}