Доступные ссылки:
Harvard: Kevrekidis, P. G., Pelinovsky, D. E.& Tyugin, D. Y. 2013. Nonlinear dynamics in pt-symmetric lattices. Journal of Physics A: Mathematical and Theoretical, 46(36), pp. 365201, doi: 10.1088/1751-8113/46/36/365201
Harvard: Kevrekidis, P. G., Pelinovsky, D. E.& Tyugin, D. Y. 2013. Nonlinear dynamics in pt-symmetric lattices. Journal of Physics A: Mathematical and Theoretical, 46(36), pp. 365201, doi: 10.1088/1751-8113/46/36/365201