M.J. Gaillard, A.G. de Pinho, J.-C. Poizat, J. Remillieux, R. Saoudi. Experimental study of the triatomic hydrogen molecule through the collisional sequence H$_3^+ \rightarrow$ H$_3 \rightarrow$ H$_3^+$ undergone by fast beams in argon.
Physical Review A, American Physical Society, 1983, 28, pp.1267-1275.
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