F. Haas, R.M. Freeman, B. Heusch, A. Gallmann, J.J. Kolata. Structure in $\gamma$-ray yields from the $^{12}$C+$^{12}$C $^{12}$C+$^{16}$O $^{16}$O+$^{16}$O and $^{12}$C+$^{14}$N reactions above the coulomb barrier.
International Conference On Resonances In Heavy Ion Reactions, May 1977, Hvar, pp.349-351.
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