Threshold behavior of semi-linear photorefractive oscillator P. Mathey, M. Grapinet, H. R. Jauslin, B. Sturman, D. Rytz and S. Odoulov Eur. Phys. J. D, 39 3 (2006) 445-451 Published online: 13 June 2006 DOI: 10.1140/epjd/e2006-00127-x