Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) YAO X. S.,Theory of beam coupling and poulse shaping of mode-locked laser pulse in a photorefractive crystal,J. Opt. Soc. Am.,,,1990,7,12,2347-2355,https://cir.nii.ac.jp/crid/1572543026543473664,