1. CheesemanI., Airship Technology, 1st ed. Cambridge Univ. Press, Cambridge, England, U.K., 1999, p. 46.
2. Aerodynamics of Airships
3. EtkinB., Dynamics of Flight, Wiley, New York, 1959, p. 79.
4. Fundamentals of Aircraft and Airship Design, Volume 2 – Airship Design and Case Studies
5. CookM., Airship Technology, 1st ed. Cambridge Univ. Press, Cambridge, England, U.K., 1999, p. 73.