Spatiotemporal wave-train instabilities in nonlinear Schrödinger equation: revisited Saliya Coulibaly, Eric Louvergneaux, Majid Taki and Léo Brevdo Eur. Phys. J. D, 69 7 (2015) 186 Published online: 28 July 2015 DOI: 10.1140/epjd/e2015-60212-7