Dharmaratne, H. Ranjith W.; N. P. Dhammika Nanayakkara; Ikhlas A. Khan (February 2002). "Kavalactones from Piper methysticum, and their 13C NMR spectroscopic analyses". Phytochemistry. 59 (4): 429–33. doi:10.1016/S0031-9422(01)00443-5. PMID11830162.
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pubmed.ncbi.nlm.nih.gov
Dharmaratne, H. Ranjith W.; N. P. Dhammika Nanayakkara; Ikhlas A. Khan (February 2002). "Kavalactones from Piper methysticum, and their 13C NMR spectroscopic analyses". Phytochemistry. 59 (4): 429–33. doi:10.1016/S0031-9422(01)00443-5. PMID11830162.