↑ Merck Index, 12th Edition, 4789 ↑ Glenn Tinseth, "Hop Aroma and Flavor", January/February 1993, Brewing Techniques. <http://realbeer.com/hops/aroma.html> Accessed July 21, 2010 ↑ Katsiotis, S. T.; Langezaal, C. R.; Scheffe, J. J. C. (1989).