中国科学院数学与系统科学研究院期刊网
Projective Indecomposable Modules and Cartan Invariants of Generalized Witt Algebra $W(2,\mathbf{1})$
LI JingZhi Hong JIANG
Acta Mathematica Sinica, Chinese Series . 2008, (5): 933 -946 .  DOI: 10.12386/A2008sxxb0109