Savotchenko, S. E. (2018). PERIODIC STATES NEAR THE PLANE DEFECT WITH NON-LINEAR RESPONSE SEPARATING NON-LINEAR SELF-FOCUSING AND LINEAR CRYSTALS. Kondensirovannye Sredy I Mezhfaznye Granitsy = Condensed Matter and Interphases, 20(2), 255-262. https://doi.org/10.17308/kcmf.2018.20/517