1. Investigation ofthe possibk inreasd incidence ofcancer in lest Cumbria;Black, D.,1984
2. World Health Orgaiation. Inteanonal classification of dises, nth revision. Geneva: WHO, 1977.
3. Population Censuses and Surveys. Cancer staistics, regitraons, 197143, Englad and Wals;Office of,MB1,
4. Childhood cancer inBritain: incidec, swvival and mortality;Draper, G.J.; Birch, J.M.; Bithell, J.F.; etal,1982
5. Accepted,1987