@article{IVM_2013_3_a5,
     author = {F. M. Ablayev and K. R. Khadiev},
     title = {Clarification of the hierarchy of classes of boolean functions representable as {a~k-OBDD} branching program models},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--61},
     publisher = {mathdoc},
     number = {3},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2013_3_a5/}
}