Le, Vu, Tuan Nguyen, and Hoa Duong. 2015. “On Some Geometric Characteristics of the Orbit Foliations of the Co-Adjoint Action of Some 5-Dimensional Solvable Lie Groups”. Science and Technology Development Journal 18 (2), 114-22. https://doi.org/https://doi.org/10.32508/stdj.v18i2.1081.