  The methods which are actively used for electronic structure calculations of
low-lying states of heavy- and superheavy-element compounds are briefly
described. The advantages and disadvantages of calculations with the
Dirac-Coulomb-Breit Hamiltonian, Huzinaga-type pseudopotential,
shape-consistent Relativistic Effective Core Potential (RECP) and Generalized
RECP are discussed. The nonvariational technique of the electronic structure
restoration in atomic cores after the RECP calculation of a molecule is
presented. The features of some approaches accounting for electron correlation,
the configuration interaction and coupled cluster methods, are also described.
The results of calculations on E113, E114, U and other heavy-atom systems are
presented.
