second phase of the Ponghwa oil refinery increased North Korea's annual oil refinery capacity to about 4-5m. tons. The refinery, built with Chinese aid, can
close ageing Shuaiba refinery on April 1. Gulf Business. 2017-03-29 [2020-08-27]. (原始内容存档于2021-11-05) (英语). Mina Abdullah Refinery. Kuwait National Petroleum
Oil Refinery Processes, A Brief Overview Colorado School of Mines, Lecture Notes (页面存档备份,存于互联网档案馆) (Chapter 10, Refining Processes, Catalytic Refinery by