@article{FPM_1996_2_2_a5,
     author = {E. Yu. Nogina},
     title = {Grzegorczyk logic with arithmetical proof operators},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {483--499},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_1996_2_2_a5/}
}