X-Ray, Radio and SEP Observations of Relativistic Gamma-Ray Events Klein, Karl-Ludwig ; Tziotziou, Kostas ; Zucca, Pietro ; Valtonen, Eino ; Vilmer, Nicole ; Malandraki, Olga E. ; Hamadache, Clarisse ; Heber, Bernd ; Kiener, Jürgen Abstract Publication: Solar Particle Radiation Storms Forecasting and Analysis Pub Date: 2018 DOI: 10.1007/978-3-319-60051-2_8 Bibcode: 2018ASSL..444..133K