Kojić, I.; Bechtel, A.; Kittinger, F.; Stevanović, N.; Obradović, M.; Stojanović, K. Study of Pyrolysis of High Density Polyethylene in the Open System and Estimation of Its Capability for Co-Pyrolysis With Lignite. J. Serb. Chem. Soc. 2018, 83, 923-940.