@article{BUMI_2002_8_5B_2_a0,
     author = {Petrich, Mario},
     title = {Some relations on the lattice of varieties of completely regular semigroups},
     journal = {Bollettino della Unione matematica italiana},
     pages = {265--278},
     publisher = {mathdoc},
     volume = {Ser. 8, 5B},
     number = {2},
     year = {2002},
     zbl = {1072.20067},
     mrnumber = {1477717},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2002_8_5B_2_a0/}
}