“Heterosis Analysis of Leaf Stomatal Characteristics on F 1 Population of Cocoa (Theobroma cacao L.) Related to Vascular-Streak Dieback Resistance” (2017) Pelita Perkebunan (a Coffee and Cocoa Research Journal), 33(3), pp. 147–155. Available at: https://mail.ccrjournal.com/index.php/ccrj/article/view/ (Accessed: 1 May 2026).