Tsarev A. V.
          The pseudorational rank of an abelian group
        We study finite-rank torsion-free abelian groups and quotient divisible 
          mixed groups. We consider the pseudorational rank, a new invariant for 
          finite-rank torsion-free groups which was introduced by A. A. Fomin, 
          and establish its connection with the usual rank. We find a condition 
          for existence of a homomorphism from one quotient divisible group into 
          the other.