1. Some E-optimal block designs;Constantine;Ann. Statist.,1981
2. Robustness of designs against the unavailability of any number of observations in a block;Das,1990
3. Robustness of augmented BIB designs;Dey;Sankhyā B,1988
4. Robustness of designs against the unavailability of data;Ghosh;Sankhyā B,1982
5. Combinatorial Theory;Hall,1986