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A. Z. Thanks-are-due-to and F. Khoury, Marin for useful discussions and to Mr. Aubert, Molva and Fulbert from LETI/CEA for the loan of microlasers. This research was carried out in the framework of the EC ESPRIT Contract ACQUIRE no. One of us (A. B.) had the support of a TMR fellowship no, ERBFMBI CT950204. APPENDIX We report the non-vanishing diffusions coefficients for the c-number Langevin forces

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