@article{ITA_1988__22_2_227_0,
     author = {Balc\'azar, Jos\'e L. and Russo, David A.},
     title = {Immunity and simplicity in relativizations of probabilistic complexity classes},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {227--244},
     publisher = {EDP-Sciences},
     volume = {22},
     number = {2},
     year = {1988},
     mrnumber = {951339},
     zbl = {0647.68053},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1988__22_2_227_0/}
}