1. Trapped antihydrogen
2. the ALPHA Collaboration Description and First Application of a New Technique to Measure the Gravitational Mass of Antihydrogen” Nat;Charman;Commun.,2013
3. Trapped Antihydrogen in Its Ground State” Phys;Gabrielse;Rev. Lett.,2012
4. Proposed Antimatter Gravity Measurement with an Antihydrogen Beam” Nucl;Kellerbauer;Instrum. Methods B,2008