@article{ZNSL_1977_68_a10,
     author = {M. Kh. Fakhmi},
     title = {Equational calculi for {Grzegorczyk's} classes~$\mathscr E^n$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {140--141},
     publisher = {mathdoc},
     volume = {68},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1977_68_a10/}
}