1. Bechter J, Serle H. British Patent No. 214, 1681.
2. Clinical observation relative to the cataract; the polyp of the nose, the cancer of the scrotum, the different kinds of rupture and the mortification of the toes and feet;Pott,1775
3. Topical treatment of psoriasis with tar;Ml̈ler;Acta Derm Venereol Suppl (Stockh),1983
4. Sensibilisatie voor pix liquida (houtteer): een persisterend probleem;Van der Hoek;Ned Tijdschr Geneeskd,1985
5. Polynuclear aromatic compounds: Part 4, Bitumens, coal tars and derived products, shale oil and soots;International Agency for Research on Cancer;IARC Monograph,1985