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2. M. Sonntag, E. Juergens, Aqueous 2-Pack Polyurethane Coatings for Automotive Refinish and Transportation, Bayer Publication.
3. Recent developments in aqueous two-component polyurethane coatings;Melchiors;Prog. Org. Coat.,2000
4. DE 19607672, EP 654051, EP 654053, EP 654055, EP 358979, EP 542105, EP 578940, EP 669352, EP 751179, EP 469389, EP 456210, etc.