The German bee monitoring project: a long term study to understand periodically high winter losses of honey bee colonies
Elke Genersch, Werner von der Ohe, Hannes Kaatz, Annette Schroeder, Christoph Otten, Ralph Büchler, Stefan Berg, Wolfgang Ritter, Werner Mühlen, Sebastian Gisder, Marina Meixner, Gerhard Liebig and Peter Rosenkranz
Apidologie, 41 3 (2010) 332-352
DOI: https://doi.org/10.1051/apido/2010014