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Cai, X.; Wang, J.; Strain, M. J.; Johnson-Morris, B.; Zhu, J.; Sorel, M.; O'Brien, J. L.; Thompson, M. G.; Yu, S. . (2012). Integrated Compact Optical Vortex Beam Emitters. Science, 338(6105), 363–366. doi:10.1126/science.1226528 

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