@article{ZNSL_1968_8_a7,
     author = {N. K. Kossovski},
     title = {On a~system of operators, simplifying the combination theory of $K$-algorithms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {66--79},
     publisher = {mathdoc},
     volume = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a7/}
}