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