Table 1: The parametric values associated with the available orderings in the literature, along with their classifications as to being admissible (i.e., λ > 2 ) or non-admissible (i.e., λ ≤ 2 ) . New admissible values are also suggested. Available ordering α = γ β λ E Admissibility Zhu and Kroemer [17], and Li and Kuhn [18] − 1 2 0 1 1 4 non-admissible Gora and Williams [15] − 0 − − non-admissible Ben Danial and Duke [16] 0 − 1 2 0 non-admissible Mustafa and Mazharimousavi [19] − 1 4 − 1 2 1 0 non-admissible New − 1 1 3 5 admissible New 1 4 − 3 2 3 0 admissible New 1 2 − 4 0 admissible New 3 4 − 5 2 5 0 admissible New 1 − 6 0 admissible 13