1.) The Good Scents Company
2.) Shengju Li, Lucky Ahmed, Ruina Zhang, Yi Pan, Hiroaki Matsunami, Jessica L. Burger, Eric Block, Victor S. Batista, and Hanyi Zhuang Smelling Sulfur: Copper and Silver Regulate the Response of Human Odorant Receptor OR2T11 to Low-Molecular-Weight Thiols Journal of the American Chemical Society 2016 138 (40), 13281-13288 DOI: 10.1021/jacs.6b06983
References for aroma perceptual qualities should not be taken to indicate that the authors of outside studies necessarily assigned aroma notes to the neurons that receive input from any given receptor. Rather, the findings of outside studies often constitute the information on which we base our own perceptual quality assignments.