@article{Parker2017, author = "Kevin J. Parker and Miguel A. Alonso", title = "{Visualization 3: Longitudinal iso-phase condition and needle pulses}", year = "2017", month = "4", url = "https://opticapublishing.figshare.com/articles/media/Visualization_3_Longitudinal_iso-phase_condition_and_needle_pulses/4950326", doi = "10.1364/OE.24.028669.v003" }