Counterpropagating surface solitons in two-dimensional photorefractive lattices Jović, Dragana ; Kivshar, Yuri S. ; Jovanović, Raka ; Belić, Milivoj Abstract Publication: Optics Express Pub Date: November 2009 DOI: 10.1364/OE.17.021515 Bibcode: 2009OExpr..1721515J