Geodesic
On difficult problems and locally graded groups
Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 2, pp. 127-133.

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Some problems that in general have a negative answer have an affirmative answer in the class of locally graded groups and a negative answer outside of this class. We present three such problems and mention other three, which possibly are of that type. 
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O. Macedońska. On difficult problems and locally graded groups. Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 2, pp. 127-133. http://geodesic.mathdoc.fr/item/FPM_2005_11_2_a8/

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