@article{ITA_2010__44_3_379_0,
     author = {Hemmerling, Armin},
     title = {Function operators spanning the arithmetical and the polynomial hierarchy},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {379--418},
     publisher = {EDP-Sciences},
     volume = {44},
     number = {3},
     year = {2010},
     doi = {10.1051/ita/2010020},
     mrnumber = {2761525},
     zbl = {1213.68294},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ita/2010020/}
}