Nonna E. Molevich,
Anton A. Krents,
Dmitry A. Anchikov,
and
Anton V. Pakhomov,
"Spontaneous Formation of Square Optical Vortex Lattice in a Transverse Section of Broad-area Laser," Proceedings of 2015 Photonics & Electromagnetics Research Symposium, Prague, July 6 - 9,Page(s)1494-1497