@article {IOPORT.03626613,
    author       = {Dang-Huy-Ruan and Tsejtin, G.S.},
    title        = {An upper estimate of the finite-state complexity for a class of generating schemes containing complements and intersections.},
    year         = {1977},
    journal      = {Journal of Soviet Mathematics},
    volume       = {8},
    issn         = {0090-4104},
    pages        = {254-262},
    publisher    = {Consultants Bureau, New York},
    doi          = {10.1007/BF01091543},
    identifier   = {03626613},
}