@article{DM_2003_15_4_a4,
     author = {A. S. Okhotin},
     title = {On the complexity of the string generation problem},
     journal = {Diskretnaya Matematika},
     pages = {84--99},
     publisher = {mathdoc},
     volume = {15},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2003_15_4_a4/}
}