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LEVIN GILBERT V., 1965, J WATER POLLUT CONTR FED, V37, P800
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Sawyer C. N, 1944, SEWAGE WORKS J, V16, P925
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SEKIKAWA Y, 1966, 3 INT C WAT POLL RES
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VACKER D, 1967, J WATER POLLUT CON F, V39, P750