SAID, A.F. 2017. EFFECT OF HYDROGEN ADDITION ON FLAME PROPAGATION CHARACTERISTICS THROUGH TUBE OF METHANE-AIR MIXTURES USING OPTICAL TECHNIQUE. Journal of Duhok University. 20, 1 (Jul. 2017), 458-464. DOI:https://doi.org/10.26682/sjuod.2017.20.1.41.