1. Fractional replication in asymmetrical factorial designs and partially balanced arrays;Chakravarti;Sankhya,1956
2. Balanced optimal 28 fractional factorial designs of resolution V, 52 ⩽ N ⩽ 59;Chopra,1975
3. Optimal balanced 28 fractional factorial designs of resolution V with 60 to 65 runs;Chopra,1975
4. Trace-optimal balanced 29 reduced designs of resolution V with 46 to 54;Chopra;J. Indian Statist. Assoc.,1977
5. Some optimal balanced reduced designs of resolution V for 29 series;Chopra,1977