@article{AUCMP_1987_28_2_a19,
     author = {Vin\'arek, J.},
     title = {Cartesian subdirect irreducibility in graphs},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {151--156},
     year = {1987},
     volume = {28},
     number = {2},
     mrnumber = {0932751},
     zbl = {0649.05060},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1987_28_2_a19/}
}