Pietruszka, N., and Z. Brzozowski. “A New Group of Liquid Reactive Nitrogen and nitrogen—phosphorus Flame Retardants for Self-Extinguishing Polyurethane Expanded Polymers. Part I. Synthesis and Properties”. Polimery, vol. 45, no. 3, Sept. 2022, pp. 184-90, doi:10.14314/polimery.2000.184.