Apopuli.133 net.lang.apl utzoo!decvax!ucbvax!G:shallit Fri Apr 9 14:47:24 1982 Re: Request for self-replicating reference The reference you need is my article on self-replicating APL expressions. It appeared in APL News, V.2 No. 1 (1977). Further articles appeared in later editions of APL News. I would be glad to mail copies of these to interested parties. /Jeff Shallit, Department of Mathematics, UC Berkeley, Berkeley, CA 94720