Computer simulation in nonlinear optics : 27 June-4 July 1993, Moscow-Nizhny Novgorod / Vladmir L. Derbov, Sergey K. Potapov, chairs/editors ; organized by Saratov State University (Russia), [and others] ; sponsored by Research Center for Control and Exploration of Physical Fields and Radiation, Russian Academy of Sciences ; cosponsored by Saratov State University, SPIE--the International Society for Optical Engineering