@article{ITA_2012__46_4_495_0,
     author = {Bianchi, Maria Paola and Pighizzini, Giovanni},
     title = {Normal forms for unary probabilistic automata},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {495--510},
     publisher = {EDP-Sciences},
     volume = {46},
     number = {4},
     year = {2012},
     doi = {10.1051/ita/2012017},
     mrnumber = {3107861},
     zbl = {1279.68132},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ita/2012017/}
}