Representing DNA/RNA with formal grammars

[Brian Scott Butler]

Since I'm not sure which bionet newsgroup to post this to I'll
try this one.

Recently, I came across some references to this.  However, they were 1988 and
 1987 and I was wondering whether anyone knew of more recent references.

Also I was wonder if there was a general area that this topic falls into?
(I'm trying to look into this and my searches are coming up blank....)

Brian Butler
bb26 at andrew.cmu.edu