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Air Force Technology
http://www.airforce-technology.com/projects/su27/
Images and brief description of craft systems.
AircraftMuseum.com
http://www.aerospaceweb.org/aircraft/fighter/su27/index.shtml
Sukhoi Su-27 'Flanker' history, specifications, schematics, pictures, and data.
Federation of American Scientists
http://www.fas.org/nuke/guide/china/aircraft/j-11.htm
Su-27 history and images.
Fighter Tactics Academy
http://www.sci.fi/~fta/Su-27.htm
SU-27 history and technical information.
Su-27, Sukhoi 'Flanker'
http://www.fighter-planes.com/info/su27.htm
The preview with technical specifications and history of creation
Sukhoi Su-27
http://www.russian.ee/~star/air/russia/index.html
Specifications, links, and photos.