1. BP (2018) BP statistical review of world energy 2018. BP, London
2. Chen L, Qi X, Tang J, Xin H, Liang Z (2021) Reaction pathways and cyclic chain model of free radicals during coal spontaneous combustion. Fuel 293:120436
3. Cho KS, Lee SH (1978) Occupational health hazards of mine workers. Bull World Health Organ 56:205
4. Deng J, Luo Z, Wu X, Hu Y (2010) Explosive limits of mixed gases containing CH4, CO and C2H4 in the goaf area. Min Sci Technol 20:557–562
5. EIA (2017) Annual energy outlook 2017 with projections to 2050. U.S. Energy Information Administration, Washington