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Frontiers in Optics 2016
Malcolm N. O'Sullivan. The research was carried out in the laboratory of Professor Boyd with contributions from Mehul Malik and Zhimin Shi. The background information in section two is based on previous results of other workers [3, 4].doi:10.1364/ls.2016.ltu1e.3 fatcat:dfwsxdzsdvhzlfmnrkp7fjo55q