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Please enter the reference using the INSPEC format: TI: Title TI: Optical vortices AU: Authors AU: Coulet,-P.; Gil,-L.; Rocca,-F. ED: Editors (if applicable) SO: Source of the document SO: Optics-Communications. 1 Nov. 1989; 73(5): 403-8 PB: Publisher (if applicable) RT: Reference type RT: Journal-Paper AB: Abstract