Petkovska, A., Babunovska, H. and Stefova, M. 2011. Fast and selective HPLC-DAD method for determination of pholcodine and related substances. Macedonian Journal of Chemistry and Chemical Engineering. 30, 2 (Dec. 2011), 139–150. DOI:https://doi.org/10.20450/mjcce.2011.28.