I've read about some studies on the Paley I Construction. Among them I found the following notations ( See this page: https://documents.uow.edu.au/~jennie/matrices/32P02.html ).

$$SNF:1,2^a,4^{b},8^{b},16^a,32$$

I am not familiar with these notations. Could you please recommend me some books or articles about it? Thanks in advance!