Special issue on nonlinear phenomena in physics: new techniques and applicationsAnastasios Bountis, Eusebius J. Doedel, Elbert E.N. Macau, Panayotis Panayotaros and Carlos L. Pando LambruschiniEur. Phys. J. Special Topics, 227 5-6 (2018) 457-461DOI: https://doi.org/10.1140/epjst/e2018-00103-0