Van der waals mixing rules for three or more components

[maistral]

The title, basically. I am aware of the mixing rule for the two-component form:

a^P = a₁z₁² + 2z₁z₂sqrt(a₁a₂) + a₂z₂²

Where do I find its extension on three or more cases? SVNA does not tell anything about this.

 

[maistral]

Nevermind. I found the formula in SVNA he just didn't explicitly said that the upper index ends at the number of components. Thanks anyway