Schwinger action principle.

The Schwinger action principle and effective action / by: (Language materials, printed)

The development of the action principle = a didactic history from Euler-Lagrange to Schwinger / by: (Electronic resources)

Quantum theory- History.

Elementary Particles, Quantum Field Theory.

Classical Mechanics.

History and Philosophical Foundations of Physics.

Mathematical physics.

Quantum theory.

Schwinger action principle.

Mathematical Physics.

Astronomy, Astrophysics and Cosmology.