Geodesic
Abelian and central extensions of aspherical groups
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1985), pp. 48-60 
I. S. Ashmanov; A. Yu. Ol'shanskiǐ. Abelian and central extensions of aspherical groups. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1985), pp. 48-60. http://geodesic.mathdoc.fr/item/IVM_1985_11_a1/
@article{IVM_1985_11_a1,
     author = {I. S. Ashmanov and A. Yu. Ol'shanskiǐ},
     title = {Abelian and central extensions of aspherical groups},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {48--60},
     year = {1985},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1985_11_a1/}
}
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