�?�?t ρ l k + �?�?x i ρ l k v l = �?�?x j μ + μ t σ k �?k �?x j + G k �?ρ l ε �?Y M All statements expressed on this page are exclusively These from the authors and don't always stand for All those of their affiliated organizations, or Those people with the publisher, the editors plus the reviewers. The fundamen