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Dürsch, I., Meyer, H. H. D., & Jäger, S. (1993). In vitro investigations of β-agonist accumulation in the eye. Analytica Chimica Acta, 275(1-2), 189–193. doi:10.1016/0003-2670(93)80291-r 
10.1016/0003-2670(93)80291-r