1. U.S. hospital-based EMS helicopter accident rate declines over the most recent seven-year period;Harris;Helicopter Safety.,1994
2. National Transportation Safety Board. Commercial emergency medical services helicopter operations. Report No. SS-88/01. Washington, DC, Jan 1988. 135.297 Federal Aviation Regulations, Feb 2, 1996.
3. EMS helicopter LOFT study shows experience influences pilot performance during inadvertent flight into IMC;Harris;Helicopter Safety.,1996
4. Factors associated with the safety of EMS helicopters;Low;Am J Emerg Med.,1991
5. 1996 annual transport statistics survey;Mayfield;Air Med.,1996