Hengstenberg, W., Kohlbrecher, D., Witt, E., Kruse, R., Christiansen, I., Peters, D., von Strandmann, R. P., Städtler, P.,
Koch, B., & Kalbitzer, H. R. (1993). Structure and function of proteins of the
phosphotransferase system and of 6-phospho-β-glycosidases in Gram-positive bacteria. FEMS Microbiology
Reviews, 12(1-3), 149-164. doi:10.1111/j.1574-6976.1993.tb00016.x.