Zozulya, Alex A. Diddams, Scott A. Media 3: Dynamics of self-focused femtosecond laser pulses in the near and far fields Originally published in Optics Express on 26 April 1999 (oe-4-9-336) 26 April 1999;media;Optics Express;self-focused femtosecond laser pulses;Dynamics;oe 1999-04-26
    https://opticapublishing.figshare.com/articles/media/Media_3_Dynamics_of_self-focused_femtosecond_laser_pulses_in_the_near_and_far_fields/4952159
10.1364/OE.4.000336.m003