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New source
edit- Piotr Dudek; "Step on the Gas", Aeroplane, April 2022. pp.125-128.
Covers the Tu-155 and its hydrogen and LPG experiments. I don't have the heart to improve this article until the attack on Ukraine is over, but I plonk the source here for future reference. — Cheers, Steelpillow (Talk) 14:59, 30 March 2022 (UTC)