P. Crivelli, A. Badertscher, W. Fetscher, S.N. Gninenko, J.P. Peigneux, et al.. A new experiment to search for the invisible decay of the orthopositronium.
Workshop on Positronium Physics, May 2003, Zurich, Switzerland. pp.3819-3833,
⟨10.1142/S0217751X04020099⟩.
⟨in2p3-00021775⟩