1. The comparison of survival curves;Armitage;J. R. Statist. Soc. A,1959
2. The chi-squared test for heterogeneity of proportions after adjustment for stratification;Armitage;J. R. Statist. Soc. B,1966
3. Isotonic tests for convex orderings;Barlow,1972
4. Asymptotic properties of isotonic estimators for the generalised failure rate function;Barlow,1970