1. Abruna F, Vicente-Chandler J and Pearson R W 1964 Effects of liming on yields and composition of heavily fertilized grasses and on soil properties under humid tropical conditions. Soil Sci. Soc. Am. Proc. 28, 657–661.
2. Abruna F, Vicente-Chandler J, Becerra L and Bosque-Lugo R 1965 Effects of liming and fertilization on yields and foliar composition of high yielding sun-grown coffee in Puerto Rico. J. Agri. Univ. Puerto Rico 49, 413–428.
3. Abruna F, Pearson R W and Perez-Escobar R 1975 Lime response of corn and beans grown on typical Oxisols and Ultisols of Puerto Rico. In Soil Management in Tropical America. N. Carolina State Univ., Raleigh, NC. pp 261–286.
4. Alluri K 1986 Screening rice varieties in acid upland soils. In Proc. Conf. on Progress in Upland Rice Research. Jakarta, Indonesia in 1985. pp. 263–270.
5. Borgonovi R A, Schaffert R E and Pitta G V E 1987 Breeding aluminum-tolerant sorghums. In Sorghum for Acid Soils. Eds. L M Gourley and J G Salinas. pp 271— 292. Proc. Workshop on Evaluating Sorghum for Tolerance to Al-toxic Trop. Soils in Latin America, held in Cali, Colombia. 28 May–2 June 1984.