N. Willis, L. Bimbot, T. Hennino, J.C. Jourdain, Y. Le Bornec, et al.. Coherent pion production in $^6$Li($^3$He, $\pi^+)^9$Be and $^{10}$B($^3$He, $\pi^+)^{13}$C close to threshold.
Physics Letters B, Elsevier, 1984, 136, pp.333-336.
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