Envelope solitons induced by high-order effects of light-plasma interaction P. K. Shukla, R. Fedele, M. Onorato and N. L. Tsintsadze Eur. Phys. J. B, 29 4 (2002) 613-618 Published online: 31 October 2002 DOI: 10.1140/epjb/e2002-00344-1