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Schoch, S. and Lempert, U. and Wieschhoff, H. and Scheer, Hugo (1978): High-performance liquid-chromatography of tetrapyrrole pigments. Pheophytin esterified with different diterpene alcohols, isomeric biliverdins and synthetic bilins. In: Journal of Chromatography, Vol. 157: pp. 357-364