@article{ZNSL_1968_8_a16,
     author = {G. E. Mints},
     title = {Cut-free calculi of the $S5$-type},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {166--174},
     publisher = {mathdoc},
     volume = {8},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1968_8_a16/}
}