@article {ahmadi2017observation, title = {Observation of the 1S{\textendash}2S transition in trapped antihydrogen}, journal = {Nature}, volume = {541}, number = {7638}, year = {2017}, pages = {506}, publisher = {Nature Publishing Group}, author = {Ahmadi, Michael and Alves, Bruno Ximenez Rodrigues and Baker, CJ and Bertsche, W and Butler, E and Capra, A and Carruth, C and Cesar, CL and Charlton, M and Cohen, S and others} }