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Papkovsky, Dmitri B. and Ponomarev, Gelii V. and Wolfbeis, Otto S. (1997) Protonation of porphyrins in liquid PVC membranes: Effects of anionic additives and application to pH-sensing. Journal of Photochemistry and Photobiology A: Chemistry 104 (1-3), pp. 151-158.
Papkovsky, Dmitri B. and Ponomarev, Gelii V. and Wolfbeis, Otto S. (1996) Longwave luminescent porphyrin probes. Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 52 (12), pp. 1629-1638.