Using two distinct BIB designs with the same number of treatments, a method of construction of balanced binary and ternary designs with unequal block sizes and unequal replications is given. The method is a generalization of the method of construction of balanced designs, given by John .
A. C. Kulshreshtha. A. Dey. G. M. Saha. "Balanced Designs with Unequal Replications and Unequal Block Sizes." Ann. Math. Statist. 43 (4) 1342 - 1345, August, 1972. https://doi.org/10.1214/aoms/1177692487