1. Von Karman Th. The impact of seaplane floats during landing. NACA Technical Note 321, October 1929.
2. Coltman JW, Neri LM. Analysis of US civil rotorcraft accidents for development of improved design criteria. National specialists meeting on crashworthy design of rotorcraft, American Helicopter Society, 1986.
3. Coltman JW, Domzalski L, Arndt SM. Evaluation of the crash environment for US Navy helicopters……the hazards and Navy response. National specialists meeting on crashworthy design of rotorcraft, American Helicopter Society, Atlanta, GA, 1986.
4. Chen CCT, Muller M, Fogary KM. Rotorcraft ditchings and water related impacts that occurred from 1982 to 1989—phase I. US Department of Transportation, FAA Technical Center, Atlantic City, DOT/FAA/CT-92/13, October 1993.
5. Muller M. Rotorcraft ditchings and water related impacts that occurred from 1982 to 1989—phase II. US Department of Transportation, FAA Technical Center, Atlantic City, DOT/FAA/CT-92/14, October 1993.