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Issue 2, 2026
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PACS numbers

04.20.Fy Canonical formalism, Lagrangians, and variational principles
  1. V.P. Kazantsev, O.A. Zolotov et al “Interaction energy of point electric multipoles” Phys. Usp. 68 843–849 (2025)
    03.50.De, 04.20.Fy, 41.20.Cv (all)
  2. A.A. Logunov, M.A. Mestvirishvili, V.A. Petrov “How were the Hilbert-Einstein equations discovered?” Phys. Usp. 47 607–621 (2004)
    01.65.+g, 04.20.Cv, 04.20.Fy (all)
  3. A.D. Sakharov “Spectral density of eigenvalues of the wave equation and vacuum polarization” Sov. Phys. Usp. 34 (5) 395–400 (1991)
    04.20.Fy, 04.50.+h, 98.80.Es (all)
  4. L.D. Faddeev “The energy problem in Einstein’s theory of gravitation (Dedicated to the memory of V. A. Fock)” Sov. Phys. Usp. 25 130–142 (1982)
    04.20.Fy, 04.50.+h (all)
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