Torsion free abelian groups of finite rank, quotient divisible groups, modules over rings of pseudo-algebraic numbers, E-rings and their generalizations
Main publications:
A. V. Grishin, A. V. Tsarev, “E-zamknutye gruppy i moduli”, Fundament. i prikl. matem., 17:2 (2012), 97–106
A. V. Tsarev, “Servantnye podkoltsa kolets $Z_X$”, Matem. sb., 200:10 (2009), 123–150
A. V. Tsarev, “Proektivnye i obrazuyuschie moduli nad koltsom psevdoratsionalnykh chisel”, Matem. zametki, 80:3 (2006), 437–448
ISTINA