@article{IM2_1991_37_3_a11,
     author = {V. V. Rybakov},
     title = {Criteria for admissibility of rules of inference with parameters in the intuituonistc propositional calculus},
     journal = {Izvestiya. Mathematics },
     pages = {693--703},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1991_37_3_a11/}
}