The multi-PMT optical module for KM3NeT. - Löhner, H.; Dorosti-Hasankiadeh, Q.; Heine, E.; Gajanana, D.; Kavatsyuk, O.; Kooijman, P.; Kopper, C.; Peek, H.; Steijger, J.; Timmer, P.; de Wolf, E. (Nuclear Instruments & Methods in Physics Research Section A, 2013)