Van Laar

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ln(γ_i) = A_i × (1-z_i)² × [1 + 2 × z_i × (A_i × B_i / |A_i × B_i| - 1)]
where

z_i = |A_i| × x_i / (|A_i| × x_i + |B_i| × (1 - x_i))

A_i = summation from j=1 to 3 of [x_j × A_ij / (1-x_i)]

B_i = summation from j=1 to 3 of [x_j × A_ji / (1-x_i)]

A₁₂ = binary parameter a₁
A₂₁ = binary parameter a₂
A_ii = 0