Bistable behaviour in squeezed vacua: II. Stability analysis and chaos H. A. Batarfi, S. S. Hassan, R. Saunders and R. K. Bullough Eur. Phys. J. D, 8 3 (2000) 417-429 Published online: 15 March 2000 DOI: 10.1007/s10053-000-8811-3