Citation: J. Tarbin et al., DETERMINATION OF PENICILLINS IN ANIMAL-TISSUES AT TRACE RESIDUE CONCENTRATIONS .1. DETERMINATION OF BENZYLPENICILLIN IN MILK BY REVERSED-PHASE LIQUID-CHROMATOGRAPHY WITH SOLID-PHASE EXTRACTION AND LIQUID-CHROMATOGRAPHIC FRACTIONATION CLEANUP, Analytica chimica acta, 318(1), 1995, pp. 95-101