Thissen, P., Wielant, J., Köyer, M., Toews, S., & Grundmeier, G. (2010). Formation and stability of organophosphonic acid monolayers on ZnAl alloy coatings. Surface & Coatings Technology, 204(21-22), 3578-3584. doi:10.1016/j.surfcoat.2010.04.027.