@article{CMUC_1987_28_4_a1,
     author = {H\'ebert, Michel},
     title = {On the reflective hull problem},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {603--606},
     year = {1987},
     volume = {28},
     number = {4},
     mrnumber = {928674},
     zbl = {0644.18002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1987_28_4_a1/}
}