EBNF

Hi,
Does anyone know of books that give a good treatment of EBNF, (ya I know I can do a google search for EBNF), but if anyone knows of any books that cover EBNF well I would really appreciate it.
Thanks,
Thomas

This http://www.garshol.priv.no/download/text/bnf.html looks like a good web source, with links onward, including to a web book.
But you probably already found it, since it was a high match on Google...

Thanks Jonathan.