4) G. Leonardos: A critical review of regulation for the control of odors, J. Air Poll. Control Assoc., 24, 456-468 (1974).
5) N. A. Heuy, L. C. Broering, G. A. Jutze, C. W. Gruber: Objective odor pollution control investigations, J. Air Poll. Control Assoc., 10, 441-446 (1960).