Aubert, B. Search for Invisible Decays of a Light Scalar in Radiative Transitions Y(3S)->gamma A0, article, November 5, 2008; (https://digital.library.unt.edu/ark:/67531/metadc901661/m1/1/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .