@article{ITA_1994__28_5_465_0,
     author = {Geffert, Viliam},
     title = {A hierarchy that does not collapse : alternations in low level space},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {465--512},
     publisher = {EDP-Sciences},
     volume = {28},
     number = {5},
     year = {1994},
     mrnumber = {1296648},
     zbl = {0884.68054},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1994__28_5_465_0/}
}