@article{ITA_1991__25_1_39_0,
     author = {Fory\'s, Wit},
     title = {On equality sets of morphisms in topological free monoids},
     journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications},
     pages = {39--42},
     publisher = {EDP-Sciences},
     volume = {25},
     number = {1},
     year = {1991},
     mrnumber = {1104409},
     zbl = {0721.68034},
     language = {en},
     url = {http://archive.numdam.org/item/ITA_1991__25_1_39_0/}
}