Casimir eigenvalues for universal Lie algebra
  For two different natural definitions of Casimir operators for simple Lie algebras we show that their eigenvalues in the adjoint representation can be expressed polynomially in the universal Vogel's parameters $\alpha, \beta, \gamma$ and give explicit formulae for the generating functions of these eigenvalues. 
R. L. Mkrtchyan, A. N. Sergeev, A. P. Veselov
math.RT