@article{10_21136_MB_1995_126220,
     author = {Chajda, Ivan and Emanovsk\'y, Petr},
     title = {Modularity and distributivity of the lattice of $\Sigma$-closed subsets of an algebraic structure},
     journal = {Mathematica Bohemica},
     pages = {209--217},
     publisher = {mathdoc},
     volume = {120},
     number = {2},
     year = {1995},
     doi = {10.21136/MB.1995.126220},
     mrnumber = {1357603},
     zbl = {0833.08002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1995.126220/}
}