@article{IVM_1990_4_a6,
     author = {I. R. Nasyrov},
     title = {A~measure of complexity for alternating automata with push-down memory},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {37--45},
     year = {1990},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1990_4_a6/}
}