Helicopter noise reduction (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Helicopter noise reduction" in English language version.

refsWebsite

Global rank English rank

1globalsecurity.org

443^rd place

435^th place

75^th place

83^rd place

207^th place

136^th place

globalsecurity.org

"Stealth Helicopter: MH-X Advanced Special Operations Helicopter". GlobalSecurity.org. Retrieved 28 April 2012.

nasa.gov

ntrs.nasa.gov

Edwards, Bryan (May 2002). "Psychoacoustic Testing of Modulated Blade Spacing for Main Rotors - NASA/CR-2002-211651" (pdf 2.5 Mb). NASA. p. 1.2. CiteSeerX 10.1.1.15.3782. Retrieved 30 January 2013.

psu.edu

citeseerx.ist.psu.edu

Edwards, Bryan (May 2002). "Psychoacoustic Testing of Modulated Blade Spacing for Main Rotors - NASA/CR-2002-211651" (pdf 2.5 Mb). NASA. p. 1.2. CiteSeerX 10.1.1.15.3782. Retrieved 30 January 2013.