A. A. Khrutchinsky and I. P. Prokopovich, "High-order-harmonic generation by ultrashort, intense laser pulses in a Raman-active medium (analytical solution),"
in Conference on Lasers and Electro-Optics, T. Deutsch, J. Goldsmith, D. Killinger, and G. Valley, eds.,
Vol. 15 of OSA Technical Digest
(Optical Society of America, 1995), paper CWF55.