1. Britt, K.W., Wet strength. In Pulp and Paper Chemistry and Chemical Technology, Third edn, (J.P. Casey, ed), Vol. III, Ch. 18, John Wiley, New York (1981), 1609–1626.
2. Dunlop-Jones, N., Wet-strength Chemistry. In Paper Chemistry, (J.C. Roberts, ed), Blackie, Glasgow and London (1991), 76–96.
3. Pfohl, S., Nassfestausrüstung von Papier mit duroplastischen Harzen, in Kunstsroffhandbuch, Vol. 10: Duroplaste, Carl Hanser Verlag, Munich and Vienna (1988), 715–723.
4. Devore, D.I. and Fischer, S.A., Tappi J., 76(8) (1993), 121–128.
5. Wågberg, L. and Björklund, M., Nordic Pulp and Paper Research Journal, 8(1) (1993), 53–58.