Murek, Mateusz, and Katarzyna Agnieszka Rutkowska. “Two Laser Beams Interaction in Photonic Crystal Fibers Infiltrated With Highly Nonlinear Materials”. Photonics Letters of Poland, vol. 6, no. 2, June 2014, pp. pp. 74-76, doi:10.4302/photon. lett. pl.v6i2.503.