@article{SF_1995__50_3_135366,
     author = {W. Li and M.C. Zhang},
     title = {On {Konieczny's} conjecture of {Boolean} matrices.},
     journal = {Semigroup forum},
     pages = {37--58},
     publisher = {mathdoc},
     volume = {50},
     number = {3},
     year = {1995},
     zbl = {0815.20063},
     url = {http://geodesic.mathdoc.fr/item/SF_1995__50_3_135366/}
}