Shvets, G. & Pukhov, A. Electromagnetically Induced Guiding of Counter-propagating Lasers in Plasmas, report, May 1998; (https://digital.library.unt.edu/ark:/67531/metadc619354/m1/1/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .