Evaluation of humic acids produced from Pakistani subbituminous coal by chemical and fungal treatments

Muhammad Adnan Sabar, Muhammad Ali, Noreen Fatima, Aneela Younas Malik, Asif Jamal, Rabia Liaquat, Huan He, Fang‐Jing Liu, Hongguang Guo, Michael A. Urynowicz, Zaixing Huang