https://www.chemorbis.com/en/plastics-news/ChemOrbis-6th-Asia-Petrochemical-Conference-Coal-dominates-China-s-PVC-market/2015/06/10/627788#reportH
https://www.chemorbis.com/en/plastics-news/Plastic-players-gather-at-ChemOrbis-6th-Asian-Petrochemical-Conference/2015/06/11/627844#reportH