Sobhana, D., et al. “Comparative Study of the Quality Factors of Two Different Cultivars of Pepper (Piper Nigrum L.)-Karimunda and Panniyur-I”. Asian Journal of Chemistry, vol. 23, no. 2, Oct. 2010, pp. 885-8, https://asianpubs.org/index.php/ajchem/article/view/15877.