Soliton excitations and interactions for the three-coupled fourth-order nonlinear Schrödinger equations in the alpha helical proteinsWen-Rong Sun, Bo Tian, Yu-Feng Wang and Hui-Ling ZhenEur. Phys. J. D, 69 6 (2015) 146DOI: https://doi.org/10.1140/epjd/e2015-60027-6