Abstract
The $L_2$ association scheme for a class of partially balanced incomplete block designs determines the parameters of the second kind. This paper considers the converse problem: do these parameters imply the $L_2$ association scheme? Necessary conditions for the existence of such designs are also obtained.
Citation
S. S. Shrikhande. "The Uniqueness of the $\mathrm{L}_2$ Association Scheme." Ann. Math. Statist. 30 (3) 781 - 798, September, 1959. https://doi.org/10.1214/aoms/1177706207
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