X-bar Chart Based on Six Sigma to Continual Quality Improvement: Implementation on Oil Vapor Pressure Characteristic, at Yemen's Aden Oil Refinery
Maǧallaẗ al-ʿulūm al-tarbawiyyaẗ wa-al-dirāsāt al-insāniyyaẗ Silsilaẗ al-ādāb wa-al-ʿulūm al-tarbawiyyaẗ wa-al-insāniyyaẗ wa-al-taṭbīqiyyaẗ