D. Q. Viet, N. V. Vinh, N. T. Cuong, N. H. Luong and V. D. Son Tho, The effect of combustion temperature to low-tar gas production using oxygen-enriched air, VJChem 55 (2017) 465. DOI: https://doi.org/10.15625/2525-2321.2017-00492.