In Vinge Vernor's story Bookworm Run!there is a sentence:“Mathematical Analysis of Voice and Electronic Pass Codes,” by Melvin M. Rosseter, RAND contract 748970-1975. Paragraph 1: Consider L, an m by n matrix (rectangular array—arrangement) of (n times m) elements (items) formed by the Vrevik product.
what is Vrevik?a man or a company's name?or other?