1. European Community (EC) Commission, 1981. Directive 87/302/EEC of 18 November, 1987; Part B: Methods for the determination of toxicity; Carcinogenicity test. Official Journal of the European Communities No. L 133, 1988, pp. 32–36
2. OECD, 1981a. Guidelines for Testing of Chemicals; Method No. 451: Carcinogenicity Studies
3. OECD, 1981b. Guidelines for Testing of Chemicals; Method No. 452: Chronic Toxicity Studies
4. Official Journal of the European Communities, No. L 147 (75/318 EEC), June 9, 1975. Council Directive of 20 May, 1975 on the approximation of the laws of Member States relating to analytical, pharmacotoxicological and clinical standards and protocols in respect to the testing of proprietary medicinal products
5. Official Journal of the European Communities, No. L 332 (83/571 EEC), November 28, 1983. Council recommendation of 26 October, 1983 concerning tests relating to the placing on the market of proprietary medicinal products