Positive formulae on free groups
Algebra i logika, Tome 5 (1966) no. 4, pp. 25-42
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@article{AL_1966_5_4_a2,
author = {Yu. I. Merzlyakov},
title = {Positive formulae on free groups},
journal = {Algebra i logika},
pages = {25--42},
publisher = {mathdoc},
volume = {5},
number = {4},
year = {1966},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/AL_1966_5_4_a2/}
}
Yu. I. Merzlyakov. Positive formulae on free groups. Algebra i logika, Tome 5 (1966) no. 4, pp. 25-42. http://geodesic.mathdoc.fr/item/AL_1966_5_4_a2/