@article{ITA_2010__44_2_193_0,
     author = {Schneider, Johannes C.},
     title = {Unambiguous erasing morphisms in free monoids},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {193--208},
     publisher = {EDP-Sciences},
     volume = {44},
     number = {2},
     year = {2010},
     doi = {10.1051/ita/2009020},
     mrnumber = {2674540},
     zbl = {1203.68132},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/ita/2009020/}
}