PT Unknown AU Kempf, S Ferring, A Fonnesu, D Gamer, L Geist, J Hassel, C Hengstler, D Krantz, M Mantegazzini, F Schulz, D Schötz, C Wegner, M Fleischmann, A Gastaldo, L Enss, C TI Physics and applications of metallic magnetic calorimeters PY 2017 LA english ER