@article{10_21136_CMJ_1983_101907,
     author = {Chajda, Ivan and Zelinka, Bohdan},
     title = {Directly decomposable tolerances on direct products of lattices and semilattices},
     journal = {Czechoslovak Mathematical Journal},
     pages = {519--521},
     publisher = {mathdoc},
     volume = {33},
     number = {4},
     year = {1983},
     doi = {10.21136/CMJ.1983.101907},
     mrnumber = {721081},
     zbl = {0538.06008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1983.101907/}
}