• Effect of storage on the essential oil composition of Piper nigrum L. fruits of different ripening statesOrav, Anne; Stulova, Irina; Kailas, Tiiu; Müürisepp, Aleksander-MatiJournal of agricultural and food chemistry2004 / p. 2582-2586 https://pubmed.ncbi.nlm.nih.gov/15113161/