Van, C. L., D. X. Khoa, N. V. Hung, and M. Trippenbach. “Dynamics of Collapse of Optical Pulses in Kerr Medium Placed in a Harmonic Potential”. Communications in Physics, vol. 20, no. 1, Aug. 2012, p. 31, doi:10.15625/0868-3166/20/1/1987.