Oyeogbe, Anthony. “Diversification of Maize-Based Intercropping Systems in Tropical Rainforest Agroecosystem of Nigeria: Productivity, Profitability and Soil Fertility”. Future of Food: Journal on Food, Agriculture and Society, vol. 9, no. 1, Feb. 2021, https://thefutureoffoodjournal.com/manuscript/index.php/FOFJ/article/view/328.