Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Takeshi Endo and T. Miyazawa and Y. Saotome,Optical resolution HPLC column packings carrying penicillin sulfoxide nucleus. Part IV. Effect of substituents in the benzyl ester group on the optical resolution efficiency,Chromatographia,0009-5893,Springer Science and Business Media LLC,1989-11-01,28,,513-515,https://cir.nii.ac.jp/crid/1870583643169962496,https://doi.org/10.1007/bf02261073