@article{ZNSL_1981_111_a0,
     author = {I. R. Agamirzyan and A. S. Ivanov},
     title = {Procedure mechanisms of abstraction},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--30},
     publisher = {mathdoc},
     volume = {111},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_111_a0/}
}