Gross, intermediate and fine structure of nuclear giant resonances: Evidence for doorway statesPeter von Neumann-Cosel, Vladimir Yu. Ponomarev, Achim Richter and Jochen WambachEur. Phys. J. A, 55 12 (2019) 224DOI: https://doi.org/10.1140/epja/i2019-12795-1