@article{ITA_1999__33_2_159_0,
     author = {Rothe, J.},
     title = {Immunity and simplicity for exact counting and other counting classes},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {159--176},
     publisher = {EDP-Sciences},
     volume = {33},
     number = {2},
     year = {1999},
     mrnumber = {1707968},
     zbl = {0946.68051},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1999__33_2_159_0/}
}