ABULHASSAN ALI, Khuram Maqsood, Rizwan Nasir. LNG as a Coolant for Direct and Indirect Configurations for Cryogenic Packed Beds. NFC IEFR Journal of Engineering and Scientific Research, [S.l.], v. 5, july 2017. ISSN 2521-0114. Available at: <http://nijesr.com/ojs/index.php/archive/article/view/16>. Date accessed: 21 oct. 2017.