@article{10_21136_CPM_1987_118320,
     author = {Havrda, Jan},
     title = {A study of independence in a set with orthogonality},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {249--256},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {1987},
     doi = {10.21136/CPM.1987.118320},
     mrnumber = {905971},
     zbl = {0629.06009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1987.118320/}
}