Analytical Letters, (1993), 26(10), pp. 2095 to 2105, PENBUTOLOL SELECTIVE MEMBRANE SENSOR, Mariana S. Ionescu, Raluca I. Ştefan, G.E. Baiulescu, A.A. Bunaciu, V.V. Coşofreţ and H.Y. Aboul-Enein.

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