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Sukhoi Su-27 - Wikipedia
How Su-27 refueling in the air? - YouTube
Sukhoi Flankers - The Shifting Balance of Regional Air Power
Sukhoi Su-27 (Flanker) - Military Factory
Sky Rivals: The Su-27 Flanker’s Roar in the Cold War Skies
Sukhoi Su-27: a high-performance fighter aircraft
Soviet Aerial Refueling - Cold War - GlobalSecurity.org
Aircraft Museum - Su-27 'Flanker' - Aerospaceweb.org
Su-27 Flanker Front-Line Fighter Aircraft, Russia
Sukhoi Su-27 | History & Facts | Britannica - Encyclopedia Britannica