1. Definitions to be used in the description and analysis of drag;Mair;Aeronautical Research Committee Current Paper No. 369 which was also published in the Journal of the Royal Aeronautical Society,1958
2. An introduction to fluid dynamics;Batchelor,1967
3. Transport phenomena;Bird,2002
4. Drag and pressure measurements on balloon models;Fuhrmann;Z. Flugtech,1911