@article{SF_1984__29_134678,
     author = {A. Ehrenfeucht and G. Rozenberg and D. Haussler and P. Zeiger},
     title = {On {DOS} languages and {DOS} mappings.},
     journal = {Semigroup forum},
     pages = {123--148},
     publisher = {mathdoc},
     volume = {29},
     year = {1984},
     zbl = {0535.68034},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134678/}
}