Yang's comment [C] is based on a lemma which claims to construct an s0 x s1 x s2 x ... x s, perfect binary array (PBA) from an s0s1 x s2 x ... x sr PBA.
Copyright © 1993, Institution of Engineering and Technology. This article first appeared in Electronics Letters: 29:11 (1993), 1001-1002.
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Jedwab, Jonathan, and James A. Davis. "Rely to "Comment on 'Nonexistence of Certain Perfect Binary Arrays' and 'Nonexistence of Perfect Binary Arrays'"" Electronics Letters 29, no. 11 (May 27, 1993): 1001-002. doi: 10.1049/el:19930667.