%0 Journal Article %A Lafuente-Rodriguez, Ramiro %A McGovern, Warren Wm. %T When ${\rm Min}(G)^{-1}$ has a clopen $\pi $-base %J Mathematica Bohemica %D 2021 %P 69-89 %V 146 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/MB.2020.0114-18/ %R 10.21136/MB.2020.0114-18 %G en %F 10_21136_MB_2020_0114_18