VARIATIONAL PRINCIPLE FOR THE INTENSITY OF FORBIDDEN TRANSITIONS.

APPLICATION OF THE BOGOLYUBOV VARIATIONAL PRINCIPLE IN NUCLEAR THEORY.

VARIATIONAL STUDY OF THE NUCLEAR MANY-BODY PROBLEM.

VARIATIONAL METHODS IN QUANTUM MECHANICS

ON THE VARIATIONAL PRINCIPLES OF QUANTUM MECHANICS

VARIATIONAL UPPER AND LOWER BOUNDS ON TRANSITION AMPLITUDES.

VARIATIONAL PRINCIPLE IN DESCRIBING A MANY-PARTICLE SYSTEM