Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Matsuda Hirotsugu,Persistence and amalgamation types in optical spectra of mixed crystals,Progress of theoretical physics = 理論物理学の進歩,0033068X,Kyoto : Publication Office,1969-02,,Suppl.1968 Extra,450-463,https://cir.nii.ac.jp/crid/1522825129570945792,https://doi.org/10.1143/ptps.e68.450