Vo Nguyen Xuan Phuong, Luong Ngoc Thuy, Le Phuc Nguyen and Nguyen Huu Luong 2019. Synthesis and characterisation of ultra-porous material for oil spill treatment based on natural cellulose extracted from office paper wastes. Petrovietnam Journal. 3, (Mar. 2019), 52-61. DOI:https://doi.org/10.25073/petrovietnam journal.v3i0.248.