Microscopic nature of the photon strength function: stable and unstable Ni and Sn isotopesOleg Achakovskiy, Alexander Avdeenkov, Stephane Goriely, Sergei Kamerdzhiev, Siegfried Krewald and Dmitriy VoitenkovEPJ Web of Conferences, 93 (2015) 01034DOI: https://doi.org/10.1051/epjconf/20159301034