Yes, IIRC about 1:20 dilution of Rodinal - but it's been years since I've done it. I think there's a thread on APUG about it. I don't remember what papers I used to try it. Probably Canadian Azo and Kentmere Bromide. The result was a somewhat cold toned print. I didn't continue because it was not very economical. I think there's also a thread about using Gainer's PC-TEA as a paper developer.