If you&#x27;re interested in left-recursion in PEGS then, at the risk of gross immodesty, you may be interested in <a href="http:&#x2F;&#x2F;tratt.net&#x2F;laurie&#x2F;research&#x2F;pubs&#x2F;html&#x2F;tratt__direct_left_recursive_parsing_expression_grammars&#x2F;" rel="nofollow">http:&#x2F;&#x2F;tratt.net&#x2F;laurie&#x2F;research&#x2F;pubs&#x2F;html&#x2F;tratt__direct_lef...</a><p>With less risk of immodesty you may also find <a href="http:&#x2F;&#x2F;arxiv.org&#x2F;pdf&#x2F;1207.0443.pdf?ref=driverlayer.com&#x2F;web" rel="nofollow">http:&#x2F;&#x2F;arxiv.org&#x2F;pdf&#x2F;1207.0443.pdf?ref=driverlayer.com&#x2F;web</a> interesting.<p>There&#x27;s probably more recent work than these two papers, but I&#x27;m a little out of date when it comes to the PEG world.