@article{10_21136_CPM_1987_118319,
     author = {Havrda, Jan},
     title = {Projection and covering in a set with orthogonality},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {245--248},
     year = {1987},
     volume = {112},
     number = {3},
     doi = {10.21136/CPM.1987.118319},
     mrnumber = {905970},
     zbl = {0629.06008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1987.118319/}
}