Applications of elliptic functions to ion-acoustic plasma waves A. H. Khater, M. M. Hassan, E. V. Krishnan and Y. Z. Peng Eur. Phys. J. D, 50 2 (2008) 177-184 Published online: 31 October 2008 DOI: 10.1140/epjd/e2008-00205-1