DIRECT INTERACTION THEORY AND NON-HERMITICITY OF THE LAPLACIAN OPERATOR.

THE OPERATOR FORMALISM IN QUANTUM PERTURBATION THEORY

HERMITICITY OR NON-HERMITICITY OF THE HAMILTONIAN FOR AN UNSTABLE PARTICLE IN QUANTUM FIELD THEORY.

Dirac theory and Hermitian interaction terms

Non-Hermitian Operators in Quantum Physics

PERTURBATION THEORY FOR RETARDED-TEMPERATURE GREEN'S FUNCTIONS. A SYSTEM OF FERMI PARTICLES WITH DIRECT INTERACTION.

ON THE ONE METHOD OF SOLUTION OF LIPPMANN-SCHWINGER'S EQUATION FOR NONHERMITIAN OPERATOR OF INTERACTION. (IN RUSSIAN)