@article{10_21136_CPM_1977_108456,
     author = {Duda, Jarom{\'\i}r and Chajda, Ivan},
     title = {Ideals of binary relational systems},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {280--291},
     publisher = {mathdoc},
     volume = {102},
     number = {3},
     year = {1977},
     doi = {10.21136/CPM.1977.108456},
     mrnumber = {0447073},
     zbl = {0356.08004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1977.108456/}
}