Jacobson's Refinement of Engel's Theorem for Leibniz Algebras
  We develop Jacobson's refinement of Engel's Theorem for Leibniz algebras. We then note some consequences of the result. 
Lindsey Bosko, J.T. Hird, Allison McAlister, Nathaniel Schwartz, and   Kristen Stagg
math.RA