Discrete Linear L1 Approximation by interval Linear Programming [E2] (Algorithm A458) CACM October, 1973 Robers, P. D. Robers, S. S. discrete approximation, L1 approximation 5.13 5.41 CA731009 JB January 20, 1978 11:13 AM 2431 5 2431 2431 5 2431 2431 5 2431