TY JOUR TI HIGH-LEVEL QUANTUM-CHEMICAL CALCULATIONS OF AZOLES, PHOSPHOLS AND PHOSPHASOLS WITHIN THE FRAMEWORK OF ELECTRON DENSITY FUNCTIONAL THEORY KW azoles KW phosphols KW phosphazoles KW 15N and 31P NMR chemical shifts KW coupled cluster with singlet and doublet amplitudes KW Jensen basis sets. JO Scientific Papers Collection of the Angarsk State Technical University AU Krivdin, L.B. PY 2019 IS 2019 PB Federal State Funded Educational Establishment of Higher Education «Angarsk State Technical University»