@article{SF_1989__39_2_134994,
     author = {J.C. Spehner},
     title = {Sur les automates qui reconnaissent une famille de langages.},
     journal = {Semigroup forum},
     pages = {323--334},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1989},
     zbl = {0678.20043},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134994/}
}