Grinshpon S.Y., Nikol'skaya (Savinkova) M.M. «IF-groups» // 2010. №1(9) C.5-14
Nikolskaya Maria Mikhailovna, Grinshpon Samuil Yakovlevich «Primary IF-groups» // 2011. №3(15) C.25-31
Savinkova M.M. «U-sequences and Primary Groups Having Proper Fully InvariantSubgroups Isomorphic Them » // 2008. №2 (3) C.56-60
