@article{VollmerNordmeier2013, author = {Michael Vollmer and V. Nordmeier}, title = {A long tradition of in-service training for physics teachers by the German Physical Society}, journal = {In: International newsletter on physics education / International Commission on Physics Education, International Union of Pure and Applied Physics 58 (2009), p. 3-4}, pages = {3 -- 4}, year = {2013}, }