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@article{AL_1993_32_5_a2, author = {S. I. Mardaev}, title = {Least fixed points in {Grzegorczyk} logic and intuitionistic}, journal = {Algebra i logika}, pages = {519--536}, publisher = {mathdoc}, volume = {32}, number = {5}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1993_32_5_a2/} }
S. I. Mardaev. Least fixed points in Grzegorczyk logic and intuitionistic. Algebra i logika, Tome 32 (1993) no. 5, pp. 519-536. http://geodesic.mathdoc.fr/item/AL_1993_32_5_a2/