@article{RSMUP_1973__50__1_0,
     author = {D\"orfler, Willibald},
     title = {Halbgruppen und {Automaten}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--18},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {50},
     year = {1973},
     mrnumber = {360900},
     zbl = {0284.20069},
     language = {de},
     url = {http://www.numdam.org/item/RSMUP_1973__50__1_0/}
}