Detlefsen, Jürgen and Hansen, Volkert. "Nachruf Prof. Dr.-Ing. Heinz Chaloupka" Frequenz, vol. 68, no. 9-10, 2014, pp. 405-406. https://doi.org/10.1515/freq-2014-0138
Detlefsen, J. and Hansen, V. (2014) Nachruf Prof. Dr.-Ing. Heinz Chaloupka. Frequenz, Vol. 68 (Issue 9-10), pp. 405-406. https://doi.org/10.1515/freq-2014-0138
Detlefsen, Jürgen and Hansen, Volkert. "Nachruf Prof. Dr.-Ing. Heinz Chaloupka" Frequenz 68, no. 9-10 (2014): 405-406. https://doi.org/10.1515/freq-2014-0138