V. A. Zagrebnov
Centre de Physique Th\'eorique and D\'{e}partement de Physique,
Universit\'e de la M\'editerran\'ee
(Aix-Marseille \2),
Luminy-Case 907, F-13288 Marseille, Cedex 09, France;
E-mail: zagrebnov@cpt.univ-mrs.fr
Quantum Fluctuations Approach is proposed as a key to understand instabilities in a Quantum Ferroelectric Model.