TY JOUR TI RELATIVISTIC EFFECTS IN CHEMICAL SHIFTS 13C NMR OF HALCOHEN-CONTAINING COMPOUNDS KW quantum chemical calculations of high level KW relativistic effects KW chemical shift KW selenium- and organoclorine-compounds. JO Modern Technologies and Scientific and Technological Progress AU Rusakov, Y.Y. AU Rusakova, I.L. AU Krivdin, L.B. PY 2020 IS 2018 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»