From: Separation of instantaneous mixtures of a particular set of dependent sources using classical ICA methods
κ 4 ( a ) ∈[ - 2 7 ,2]
κ 4 ( a ) ∉[ - 2 7 ,2]
s 1 and s 2 only
G mixing, G ij =± 1 2
G separating
s 1,s 2 and s 3
G extracts s 3