@article{COMIM_1993_1_1_a6,
     author = {Skula, Ladislav},
     title = {Maximal reflectivity preserving subextensions},
     journal = {Communications in Mathematics},
     pages = {59--66},
     year = {1993},
     volume = {1},
     number = {1},
     mrnumber = {1250927},
     zbl = {0921.18001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/COMIM_1993_1_1_a6/}
}