Yadukumar, Rajendra Hegde, M M Hosman, V. S. K. S. J. A. N. “Microclimatic and Photosynthetic Characteristics in Arecanut and Cardamom Mixed Cropping System”. Journal of Spices and Aromatic Crops, vol. 9, no. 1, June 2000, pp. 61-63, https://updatepublishing.com/journal/index.php/josac/article/view/4552.