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Raju, Ganapathi S and Khan, Nayeem U and Vaidyanathan, CS (1983) Separation of protocatechuate and homoprotocatechuate by paper chromatography and estimation of protocatechuate by colorimetry using a new $FeCl_3$ reagent. In: Journal of the Indian Institute of Science, 64 (3). pp. 1-10.