PT Journal AU Loidl, M Beyer, J Bockhorn, L Bonaparte, JJ Enss, C Kempf, S Kossert, K Mariam, R Nähle, O Paulsen, M Ranitzsch, P Rodrigues, M Wegner, M TI Precision Measurements of Beta Spectra using Metallic Magnetic Calorimeters within the European Metrology Research Project MetroBeta SO Journal of low temperature physics PY 2020 BP 451 EP 460 VL 199 IS 1-2 DI 10.1007/s10909-020-02398-2 LA english ER