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Serpek, B., Elsaesser, F., & Meyer, H. H. D. (1993). Development of an enzyme immunoassay for the determination of porcine growth hormone in plasma. Analytica Chimica Acta, 275(1-2), 183–187. doi:10.1016/0003-2670(93)80290-2 
10.1016/0003-2670(93)80290-2