Ying, Y.-M. et al. 2012. Studies on the Metabolites of a Fungal Endophyte Penicillium sp. HS-5 from Huperzia serrata. Asian Journal of Chemistry. 25, 3 (Oct. 2012), 1208–1210. DOI:https://doi.org/10.14233/ajchem.2013.12350.