W. Maneschg, L. Baudis, R. Dressler, K. Eberhardt, R. Eichler, H. Keller, R. Lackner, B. Praast, R. Santorelli, J. Schreiner, M. Tarka, B. Wiegel, A. Zimbal.
NIM A Volume 680, 11 July 2012, Pages 161 – 167.
doi: 10.1016/j.nima.2012.04.019
Preprint: arXiv:1110.1217
Production and characterization of a custom-made 228Th source with reduced neutron source strength for the Borexino experiment