1. Official;Resolution of 7 July, 1986;Journal of the European Union,1986
2. Official;Decision of 7 November 1987;Journal of the European Union,1987
3. Official;Decision of 17 May 1988;Journal of the European Union,1988
4. Official;Cancer Plan 1987–1989;Journal of the European Union,1987
5. Statistical methods for registries;Boyle,1991