Pham, T., and Q. Hoang. “Fireproof Behavior of Polyurethane Foam Based on Waste Poly(ethylene Terephthalate) Using Aluminum Hydrogen Phosphonate Flame Retardant”. VNUHCM Journal of Natural Sciences, Vol. 2, no. 2, May 2019, pp. 88-94, doi:https://doi.org/10.32508/stdjns.v2i2.739.