M. M. Bande, J. Grenz, V. B. Asio, and J. Sauerborn, “Nutrient Uptake and Fiber Yield of Abaca (Musa textilis var. Laylay) as Affected by Shade, Irrigation and Fertilizer Application”, Ann. Trop. Res, vol. 34, no. 1, pp. 1–28, May 2012.