1. On the covering of pairs by quadruples;Assaf;Discrete Math.,1986
2. Modified group divisible designs;Assaf;Ars Combin.,1990
3. Resolvable group divisible designs with block size three;Assaf;Discrete Math.,1989
4. On r-fold perfect Mendelsohn designs;Bennett;Ars Combin.,1987
5. Bounds for binary codes of length less than 25;Best;IEEE Trans. Inform. Theory,1977