�?�?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 Note: Drillopedia.com is a submission-based know-how-sharing website. Contributors post info dependent on their own understanding and encounter. waiting for link from Forum Profiles (6)