Gudrun Heisterberg-Moutsis, Rainer Heinz, Thomas F. Wolf, Dominic J. Harper, David James, Richard P. Mazzur, Volker Kettler, Hansgert Soiné “Floor Coverings” Ullmann's Encyclopedia of Industrial Chemistry 2002, Wiley-VCH, Weinheim. doi:10.1002/14356007.a11_263