@article{10_21136_CMJ_1991_102445,
     author = {Chajda, Ivan},
     title = {Weak coherence of congruences},
     journal = {Czechoslovak Mathematical Journal},
     pages = {149--154},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1991},
     doi = {10.21136/CMJ.1991.102445},
     mrnumber = {1087635},
     zbl = {0796.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102445/}
}