Birth and evolution of an optical vortex published in Optics Express! 25 Luglio 201625 Luglio 2016 G. Vallone, A. Sponselli, V. D’Ambrosio, L. Marrucci, F. Sciarrino, P. Villoresi, “Birth and evolution of an optical vortex”, Opt. Express 24(15), 16390-16395 (2016)
