@article{VollmerMoellmann2019, author = {Michael Vollmer and Klaus-Peter M{\"o}llmann}, title = {Direct speed of sound measurement within the atmosphere during a national holiday in New Zealand}, journal = {Physics Education}, volume = {53}, number = {3}, pages = {033007 -- 033007}, doi = {10.1088/1361-6552/aab6ce}, year = {2019}, }