A. Ferrando, M. Zacares, P. Fernandez-de-cordoba, D. Binosi, and J. , Monsoriu Spatial soliton formation in photonic crystal fibers, Opt. Express, p.11, 2003.

G. Fibich and A. L. , Gaeta Critical power for self-focusing in bulk media and in hollow waveguides, Opt. Lett, p.25, 2000.