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de Marcos, Susana and Hortigüela, Rubén and Gatbán, Javier and Castillo , Juan R. and Wolfbeis, Otto S. (1999) Characterization of a urea optical sensor based on polypyrrole. Microchimica Acta 130 (4), pp. 267-272.
de Marcos, Susana and Wolfbeis, Otto S. (1996) Optical sensing of pH based on polypyrrole films. Analytica Chimica Acta 334, pp. 149-153.