%0 Journal Article %A Petrich, Mario %T A semilattice of varieties of completely regular semigroups %J Mathematica Bohemica %D 2020 %P 1-14 %V 145 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.2018.0112-17/ %R 10.21136/MB.2018.0112-17 %G en %F 10_21136_MB_2018_0112_17