Leibniz Algebras and Lie Algebras
  This paper concerns the algebraic structure of finite-dimensional complex Leibniz algebras. In particular, we introduce left central and symmetric Leibniz algebras, and study the poset of Lie subalgebras using an associative bilinear pairing taking values in the Leibniz kernel. 
Geoffrey Mason and Gaywalee Yamskulna
math.RA