@article{ZNSL_1972_32_a16,
     author = {M. Kh. Fakhmi},
     title = {An equation calculus for primitive recursive rational-valued functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {116--120},
     publisher = {mathdoc},
     volume = {32},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1972_32_a16/}
}