The Sverdlovsk tetrad.
Semigroup forum, Tome 4 (1972), pp. 274-280.

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     author = {L.N. Shevrin},
     title = {The {Sverdlovsk} tetrad.},
     journal = {Semigroup forum},
     pages = {274--280},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133906/}
}
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L.N. Shevrin. The Sverdlovsk tetrad.. Semigroup forum, Tome 4 (1972), pp. 274-280. http://geodesic.mathdoc.fr/item/SF_1972__4_133906/