Modified Havie Integration (Algorithm R400) CACM June, 1974 Piessens, R. CA740606 JB January 17, 1978 3:04 PM 2350 4 2640 2354 4 2640 2640 4 2640 2355 5 2640 2640 5 2640 2640 5 2640 2640 5 2640