Liron Stern, Desiatov, Boris , Goykhman, Ilya , Lerman, Gilad M. , and Levy, Uriel . 6/6/2011. “Near Field Phase Mapping Exploiting Intrinsic Oscillations Of Aperture Nsom Probe”. Optics Express, 19, 13, Pp. 12014-12020. https://www.osapublishing.org/oe/abstract.cfm?uri=oe-19-13-12014.