Study on ammonium-promoted phenol-formaldehyde-based gel for enhanced oil recovery and its seepage characteristics in porous mediaHongshen Wang, Jinlin Wang, Duansheng Shi, Lei Yang, Ruoshui Han, Fujian Yin, Yimin Han and Siqi LiuMATEC Web Conf., 356 (2022) 01010DOI: https://doi.org/10.1051/matecconf/202235601010