1. Ayers, J. W. 1963: Composition comprising lignocellulosic extender and oxidized extracted lignin and adhesive solution containing same. USA-Pat. Nr 3093 604
2. Calvé, L.; Fréchet, J. M. 1983: Wood adhesives based on lignin wastes: influence of the carbohydrate in the polymerization of spent sulfite liquor. J. Appl. Polym. Sci. 28:1969–1980
3. Forss, K.; Fuhrmann, A. 1976: KARATEX—the lignin-based adhesive for plywood, particleboard and fiberboard. Paperi ja Puu 11:817–824
4. Forss, K. 1982: Persönliche Mitteilung
5. Glasser, W. G.; Hsu, O. H. H. 1977: Polyurethane intermediates and products and methods of producing same from lignin. USA Pat. Nr. 4017474