http://pec.lib.wvu.edu/record/P88471961Effect of terephthalic acid on the activity of chlortetracycline and oxytetracycline.Journal article reprint from: <em>Avian Diseases</em>, v.5:no.1 (1961:Feb.).Shelton, D. C.Olson, N. O.Antibiotics in animal nutrition--Research.Tetracyclines.Birds--Feeding and feeds--Research.Terephthalic acid.14256