1. Adu SV, Asiamah RD (1992) Soils of the Ayensu-Densu basin. Memoir No. 9: Soil Research Institute/Council for Scientific and Industrial Research. Kumasi, Ghana
2. Agwanda CO, Baradat P, Cilas C, Charrier P (1997) Genotype-by-environment interaction and its implications on selection for improved quality in Arabica coffee (Coffea arabica L.). In: 17th International Scientific Colloquium on Coffee, 20–25 July 1997 Nairobi, Kenya, pp 424–429
3. Akpertey A, Anim-Kwapong E, Ofori A (2018) Genetic variation among Robusta coffee genotypes for growth and yield traits in Ghana. J Agric Sci 10:138–149
4. Akpertey A, Anim-Kwapong E, Adu-Gyamfi PKK, Ofori A (2020) Genetic variation among biparental Robusta coffee families and implications for variety development. Exp Agric 56:171–182
5. Alvarado G, Lopez M, Vargas M, Pacheco FR, Burgueno J, Crossa J (2016) META-R (Multi Environment Trial Analysis with R for Windows) version 6.0. International Maize and Wheat Improvement Center. http://hdl.handle.net/11529/10201