RANDOM PHASE APPROXIMATION AND A NEW RENORMALIZATION EFFECT OF THE FORCE- STRENGTH IN COLLECTIVE EXCITATIONS.

THE RANDOM PHASE APPROXIMATION AND THE SEPARATION OF COLLECTIVE DEGREES OF FREEDOM.

THE NUMBER SELF-CONSISTENT RENORMALIZED RANDOM PHASE APPROXIMATION

COLLECTIVE EXCITATIONS WITH THE NUMBER-PROJECTED WAVE FUNCTIONS.

SIMPLIFIED VERSION OF THE RANDOM-PHASE APPROXIMATION AND THE PROBLEM OF THE CORRELATION ENERGY OF A MANY-FERMION SYSTEM.

The Random-Phase Approximation for Collective Excitations

THEORY OF EXCITATIONS IN A FERMION SYSTEM WITH LARGE QUNANTUM FLUCTUATIIONS : RESONATING HB APPROXIMATION AND RESONATING HB RPA