@article{ITA_1990__24_3_229_0,
     author = {Ko, Ker-I},
     title = {A note on separating the relativized polynomial time hierarchy by immune sets},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {229--240},
     publisher = {EDP-Sciences},
     volume = {24},
     number = {3},
     year = {1990},
     mrnumber = {1072992},
     zbl = {0701.68032},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1990__24_3_229_0/}
}