Second neighbors inducing common frequencies for bright and dark solitonsE. Tala-Tebue, Z. I. Djoufack, A. Kenfack-Jiotsa, F. Kapche-Tagne and T. C. KofanéEur. Phys. J. Plus, 132 6 (2017) 272DOI: https://doi.org/10.1140/epjp/i2017-11535-4