@article{ZNSL_1975_49_a1,
     author = {S. Yu. Maslov},
     title = {The mutation-calculuses},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {7--30},
     publisher = {mathdoc},
     volume = {49},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1975_49_a1/}
}