I think the article was in Pool & Billiard Magazine. It starts on page 116 of the July 1995 issue. For those of you who don't have a copy of that issue, here is a PDF republished with permission:There was an article a long time ago in Billiards Digest about how different pro players aim. I still have it somewhere. Most all of them said they just see the shot. Efren said something about centers and edges. Exactly what he meant isn't clear but he did mention it.
Here is another item from that page related to aiming that some might find useful: