@article{10_21136_MB_2019_0050_18,
     author = {Petrich, Mario},
     title = {Relations on a lattice of varieties of completely regular semigroups},
     journal = {Mathematica Bohemica},
     pages = {225--240},
     publisher = {mathdoc},
     volume = {145},
     number = {3},
     year = {2020},
     doi = {10.21136/MB.2019.0050-18},
     mrnumber = {4221831},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.2019.0050-18/}
}