Silhavy, Hartig-Beecken, and Boos. (1976) 1976. “Periplasmic Protein Related to the Sn-Glycerol-3-Phosphate Transport System of Escherichia Coli”. J Bacteriol 126 (2): 951-8. doi:10.1128/jb.126.2.951-958.1976. Reference Link