Uddin, Nizam; Chen, Q.; Patil, S. A. Equireplicate balanced block designs with nested rows and columns with at most two unequal block sizes. (English) Zbl 0887.62082 Util. Math. 52, 49-64 (1997). Methods of constructing universally optimal equireplicate balanced block designs with nested rows and columns with at most two unequal block sizes are given. The universal optimality is based upon a homoscedastic fixed effects model. Homoscedasticity is somewhat questionable when the block sizes differ considerably. A list of parameters of 115 designs and their solutions are given. Reviewer: D.Raghavarao (Philadelphia) MSC: 62K05 Optimal statistical designs 62K10 Statistical block designs 05B05 Combinatorial aspects of block designs Keywords:balanced incomplete block designs; universal optimality PDFBibTeX XMLCite \textit{N. Uddin} et al., Util. Math. 52, 49--64 (1997; Zbl 0887.62082)