@article{JOLT_2021_31_2_a5,
     author = {Xiao-Peng Chen and Shi-Zhong Du and Tian-Pei Guo},
     title = {The {Liouville} {Theorem} of a {Torsion} {System} and its {Application} to the {Symmetry} {Group} of a {Porous} {Medium} {Type} {Equation} on {Symmetric} {Spaces}},
     journal = {Journal of Lie Theory},
     pages = {393--411},
     year = {2021},
     volume = {31},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JOLT_2021_31_2_a5/}
}