@article{CM_1989__71_2_139_0,
     author = {de Valk, V.},
     title = {A problem on $0-1$ matrices},
     journal = {Compositio Mathematica},
     pages = {139--179},
     publisher = {Kluwer Academic Publishers},
     volume = {71},
     number = {2},
     year = {1989},
     mrnumber = {1012638},
     zbl = {0741.15007},
     language = {en},
     url = {http://www.numdam.org/item/CM_1989__71_2_139_0/}
}