@article{NSJOM_1999_29_2a_4,
     author = {S. 

 Bogdanovi\'c and B. Imreh and M. Ciri\'c and T. Petkovi\'c},
     title = {Directable automata and their generalizations: a survey},
     journal = {Novi Sad Journal of Mathematics},
     pages = {29-69},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1999},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1999_29_2a_4/}
}