L. Bimbot, M.P. Combes, J.C. Jourdain, Y. Le Bornec, F. Reide, et al.. Experimental study of coherent pion production in $^4$He($^3$He, $\pi^+)^7$Li and a test of the reaction mechanism.
Physics Letters B, Elsevier, 1982, 114, pp.311-314.
⟨in2p3-00016860⟩