1. Bose, R. C. (1947). Mathematical theory of symmetrical factorial design. Sankhy$$\bar{{\rm a}}$$, 8, 107–166.
2. Das, P. (2003). On designs with pencilwise orthogonality and balance. Electronic notes in Discrete Mathematics, 15, 72–74.
3. Das, P., & Chatterjee, B. (1999). On partial balance with orthogonal sub-factorial structure. Calcutta Statistical Association Bulletin, 49, 195–196.
4. Fisher, R. A., & Yates, F. (1943). Statistical tables for biological, agricultural and medical research. Edinburg: Oliver and Boyd.
5. Gupta, S. (1983). A basic lemma and the analysis of of block and kronecker product designs. Journal of Statistical Planning and Inference, 7, 407–416.