section_heading: Vanjske poveznice
paragraph_text: BOOK SECTIONS 1)	Section "Integer and Fractional Angular Momentum Borne on Self-Trapped Necklace-ring Beams" by Marin Soljacic, and Mordechai Segev in: Optical Angular Momentum. Editors: L. Allen, Miles J. Padgett, and S. M. Barnett. (Institute of Physics Pub, March 2003). 2)	Essay “Photonic Crystals” by Steven G. Johnson, Marin Soljacic, and J.D. Joannopoulos in: Encyclopedia of Nonlinear Science. Editor: Alwyn Scott. (Routledge, December 2004).