J.M. Friedt, R. Poinsot, J. Rebizant, W. Mueller. $^{237}$Np Moessbauer study of the after effects of the $^{241}$Am $\alpha$-decay in some metallic and insulating hosts.
Journal of Physics and Chemistry of Solids, Elsevier, 1979, 40, pp.279-287.
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