Abruptly autofocusing vortex beams. Davis, J. A., Cottrell, D. M., & Sand, D. Optics Express, 20(12):13302, June, 2012.
Abruptly autofocusing vortex beams [link]Paper  doi  bibtex   
@article{davis_abruptly_2012,
	title = {Abruptly autofocusing vortex beams},
	volume = {20},
	issn = {1094-4087},
	url = {https://www.osapublishing.org/oe/abstract.cfm?uri=oe-20-12-13302},
	doi = {10.1364/OE.20.013302},
	language = {en},
	number = {12},
	urldate = {2016-03-01TZ},
	journal = {Optics Express},
	author = {Davis, Jeffrey A. and Cottrell, Don M. and Sand, David},
	month = jun,
	year = {2012},
	pages = {13302}
}

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