Geodesic
On subgroups with summarized endomorphisms
Algebra i logika, Tome 6 (1967) no. 1, pp. 9-14 
V. P. Belkin. On subgroups with summarized endomorphisms. Algebra i logika, Tome 6 (1967) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/AL_1967_6_1_a1/
@article{AL_1967_6_1_a1,
     author = {V. P. Belkin},
     title = {On subgroups with summarized endomorphisms},
     journal = {Algebra i logika},
     pages = {9--14},
     year = {1967},
     volume = {6},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AL_1967_6_1_a1/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

An example is given of a subgroup with summarized endomorphisms which does not satisfy the entropic law $xy\cdot zv=xz\cdot yv$.