1. Matheson, N.: Stability of helicopter sling loads. Technical report aerodynamics note 364, Department of Defence, Aeronautical Research Laboratories, Melbourne, Victoria, Australia, 1976
2. Pavel, M.D., Masarati, P., Smaili, H.: A retrospective survey of adverse rotorcraft pilot couplings in European perspective. In: Proceedings of the American Helicopter Society 68th Annual Forum, Forth Worth, TX, USA, 1–3 May 2012
3. Hanno, B.: Simulation model for helicopter cargo handling investigations. In: Proceedings of the 7th ONERA DLR Aerospace Symposium, Toulouse, France, 10 October 2006
4. Bisgaard, M.: Modeling, estimation, and control of helicopter slung load system. PhD thesis, Department of Electronic Systems, Section for Automation and Control, Aalborg University, Aalborg, November 2007
5. Shaughnessy, J.D, Pardue, M.D.: Helicopter sling load accident/incident survey: 1968–1974. Technical Report TM X-74007, National Aeronautics and Space Administration-NASA, Langley Research Center, Hampton, Virgina, USA, March 1977