@article{DM_1993_5_1_a7,
     author = {L. A. Arutyunyan},
     title = {On the lattice of closed classes of nonhomogeneous functions with a~trace of type~$C$},
     journal = {Diskretnaya Matematika},
     pages = {130--145},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_1993_5_1_a7/}
}