Fast pyrolysis of pulp and paper mill sludge in a bubbling fluidized bed: Unlocking energy potential through insights into tar formation and combustion characteristics - Chen, Fangjun; Ren, Guanlong; Long, Hua; Shahzad Khurram, Muhammad; Lang, Lin; Ström, Henrik; Vladimirovich, Vasilevich Sergey; Oboirien, Bilainu Obozokhai; Xiong, Qingang (Renewable Energy, 2026)