Geodesic
Schreier varieties of $n$-semigroups
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1984), pp. 17-21 
Yu. A. Khashina. Schreier varieties of $n$-semigroups. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (1984), pp. 17-21. http://geodesic.mathdoc.fr/item/VMUMM_1984_1_a3/
@article{VMUMM_1984_1_a3,
     author = {Yu. A. Khashina},
     title = {Schreier varieties of $n$-semigroups},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {17--21},
     year = {1984},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1984_1_a3/}
}
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