1. Fractional replication in asymmetrical factorial designs and partially balanced arrays;Chakravarti;Sankhyā,1956
2. On some methods of construction of partially balanced arrays;Chakravarti;Ann. Math. Statist.,1961
3. Balanced optimal 28 fractional factorial designs of resolution V, 52≤N≤59;Chopra,1975
4. Optimal balanced 28 fractional factorial designs of resolution V, with 60 to 65 runs;Chopra;Bull. Internat. Statist. Inst.,1975
5. A note on balanced arrays of strength four;Chopra;Sankhyā B,1982