The Franco-Benoni defense is characterized by the black moves:
[fen ""] [startply "4"] 1. e4 e6 2. d4 c5
The books I've read on the French defense contain none or very little information about this opening. Are there any "authoritative" or "main line" references or books that investigate this opening? Are any of you using this opening in your games? Where do you get your information from?