1. A relationship between cancer of the stomach and the ABO blood groups;Aird;British Medical Journal,1953
2. Genetic heterogeneity;Childs;New England Journal of Medicine,1968
3. Polymorphism;Clarke,1969
4. ABO blood groups and secretor character in duodenal ulcer;Clarke;British Medical Journal,1956
5. Pitfalls and problems in genetic studies;Clarke,1969