@article{MZM_1996_60_6_a9,
     author = {E. M. Kovyazina},
     title = {Butler groups with a single $\tau$-adic relation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {882--887},
     publisher = {mathdoc},
     volume = {60},
     number = {6},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1996_60_6_a9/}
}