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- [24] HIGHER-ORDER VARIATIONAL PRINCIPLES AND PADE APPROXIMANTS FOR LINEAR FUNCTIONALS TRANSACTIONS OF THE AMERICAN NUCLEAR SOCIETY, 1973, 17 (NOV): : 240 - 241
- [27] SCHWINGER VARIATIONAL PRINCIPLE IN SCATTERING-THEORY ACTA PHYSICA POLONICA B, 1994, 25 (11): : 1547 - 1567