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), 147-155. https://mail.ccrjournal.com/index.php/ccrj/article/view/