H. S Eisenberg, Morandotti, R. , Silberberg, Y. , Arnold, J. M, Pennelli, G. , and Aitchison, J. S. 2002. ?Optical Discrete Solitons In Waveguide Arrays. I. Soliton Formation?. J. Opt. Soc. Am. B, Josab, 19, Pp. 2938?2944. doi:10.1364/JOSAB.19.002938.