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- [2] USEFUL EXTREMUM PRINCIPLE FOR VARIATIONAL CALCULATION OF MATRIX-ELEMENTS PHYSICAL REVIEW A, 1974, 9 (01): : 108 - 117
- [3] VARIATIONAL CALCULATION OF MATRIX-ELEMENTS OF OPERATOR PADE APPROXIMANTS LETTERE AL NUOVO CIMENTO, 1981, 31 (06): : 226 - 230
- [7] COVARIANT CALCULATION OF MATRIX-ELEMENTS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII FIZIKA, 1980, (02): : 32 - 45