Environmental conditions constrain the distribution and diversity of archaeal merA in Yellowstone National Park, Wyoming, U.S.A., Lu-Irving Patricia, Wang Yanping, Boyd Eric, Crane Sharron, Krabbenhoft David, King Susan, Dighton John, Geesey Gill, and Barkay Tamar, Microbial Ecology, 2011 Nov, Volume 62, Issue 4, p.739-52 (2011)