Manuel Ceballos and  Juan Nunez and  Angel F. Tenorio,  Computational Algorithm for Obtaining Abelian Subalgebras in Lie Algebras.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2009, vol. 34(10). 879 - 883
    [viewed 26 January 2020]. Available from: https://publications.waset.org/pdf/11417.