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метод связанных кластеров, включающий однократные и двукратные возбуждения, а также возмущающе включённые тройные замещения stresses
gen.	coupled-cluster method which includes single and double excitations as well as perturbatively included triple substitutients; CCSDT method coupled-cluster method which includes single and double excitations as well as perturbatively included triple substitutients