@article{CMUC_1991_32_1_a17,
     author = {Schlitt, Greg M.},
     title = {N-compact frames},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {173--187},
     year = {1991},
     volume = {32},
     number = {1},
     mrnumber = {1118300},
     zbl = {0747.06009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1991_32_1_a17/}
}