Limit on sterile neutrino contribution from the Mainz Neutrino Mass Experiment Christine Kraus, Andrej Singer, Kathrin Valerius and Christian Weinheimer Eur. Phys. J. C, 73 2 (2013) 2323 Published online: 26 February 2013 DOI: 10.1140/epjc/s10052-013-2323-z