Research Publications 

1. K.P.U. de Silva,  G.S. Premachandra and A. Prematilake. 1983. Effect of N fertilizer and method of control of vine growth on tuber yield of Sweetpotato. Journal of Agriculture Science, Vol. 20:97-104.
2. K.P.U. de Silva,  P.S. A.D.  Prematilake and J.C.K. Basnayake. 1984. Determination of maturity parameters at different growth stages in selected Cassava cultivars. Proc. Sri Lanka Ass. Advancement Sci. 5: 40 (1). 
3. K.P.U. de Silva,  P.S. A.D.  Prematilake. 1984. Cassava - Legume intercropping systems: Effect on spatial arrangement on crop yield and utilization. Proc. Sri Lanka Ass. Advancement Sci. 
4. Prematilake, P.S.A.D. and K.P.U. de Silva. 1984. Mixed Cropping of sweetpotato with grain legume. Proc. Sri Lanka Ass. Advmt. Sci. 40(1). 
5. Prematilake, P.S.A.D. and K.P.U. de Silva. 1984. Effect of time of harvesting and growing seasons on weevil infestation in Sweetpotato. Proce. Sri Lanka Ass. Advmt. Sci. 40(1).
6. Prematrilake, P.S.A.D., K.P.U. de Silva, R. Gunatunge and S.D.G. Jayawardana. 1988. Feasibility of growing vegetable with Sweetpotato. Proc. Sri Lanka Ass. Advmt. Sci. 44(1). 
7. De Silava, K.P.U., J.C.K. Basnayake, P.S.A.D. Prematilake and S.D.G. Jayawardana. 1988. Performance of promising Sweetpotato line, CARI-426 developed through poly-cross breeding. Proc. Sri Lanka Ass. Advmt. Sci. 44(1). 
8. Prematilake, P.S.A.D., K.P. Premarathne and F.A. Saladada. 1988. Effect of NPK fertilizer on yield parameters of Sweetpotato plant types. Sri Lanka journal of Agric. Sci. Vol:25-1 p.139-146.
9. De Silva, K.P.U., H.D. Jayawickrama  and A. Premathilake. 1994. Screening of Sweetpotato genotypes under different rice-fallow environments. Selected Research Papers - 1993/94, Vol.2 : Sweetpotato, SAPPRAD, Philippines.
10. De Silva, K.P.U., H.D. Jayawickrama  and A. Premathilake. 1994. Cultural control of Sweetpotato weevil. Selected Research Papers - 1993/94, Vo.2 : Sweetpotato, Editors : E.T. Rasco and V.D.R. A,amte, SAPPRAD, Philippines.
11. De Silva, K.P.U., H.D. Jayawickrama , A. Premathilake and K. Setunga. 1994. Pattern of physiological deterioration due to recycling of Sweetpotato vines. Selected Research papers - 1993/94, Vol.2 : Sweetpotato, Editors: E.T. Rasco and V.D.R. Amante, SAPPRAD, Philippines.
12. De Silva, K.P.U., H.D. Jayawickrama  and A. Premathilake. 1995. Comparison of cultivation methods of Sweetpotato in rice-fallow lands. selected Research papers - 1994/95. Vol.2 : Sweetpotato SAPPRAD, Philippines.
13. De Silva, K.P.U., H.D.  Jayawickrama, and A. Premathilake. 1995. Screening of Sweetpotato genotypes in rice-fallow environments: of users' in variety development of Sweetpotato. Selected Research Paper - 1994/95, Vol.2 : Sweetpotato, SAPPRAD, Philippines.
14. Premathilake, A. and K.P.U. de Silva. 1995. Pattern of physiological deterioration upon recycling of Sweetpotato vines : effect of variety. Selected Research Papers - 1994/95, Vol.2 : Sweetpotato, SAPPRAD. Philippines.
15. De Silva, K.P.U. and A. Premathilake. 1996. Effect of variety and number of generations of vegetative propagation on vegetative and yield traits of Sweetpotato. Selected Research papers - 1995/96, Vol.2 : Sweetpotato, SAPPRAD, Philippines.
16. De Silva, K.P.U., H.D. Jayawickrama and A. Premathilake. 1996. Evaluation of user-selected Sweetpotato clones in rice-fallow environments, Selected Research papers - 1995/96, Vol.2 : Sweetpotato, SAPPRAD, Philippines.
17. Bandara,S. and  A. Premathilake. 1996. Work relating to utilization of plant genetic resources in crop improvement by selection. In proceedings of workshop on present status and future prospects of plant genetic resources. P 116-120.
18. Amante, V.D.R.,  E.T. Rasco, and A. Premathilake. 1994. Varietal evaluation of sweetpotato under upland reinfed, open field condition. Selected Research Papers 1993-1994 Vol.2: Sweetpotato, SAPPRAD, Philippines.
19. Premathilake, A. 1999. Sweetpotato Germplasm conservation and breeding in the Department of Agriculture, Sri Lanka In proceedings of Asian Network for sweetpotato Genetic Resources (ANSWER). Strengthening National Capacity and Regional Collaboration.
20. Premathilake A.and A.R.M. Maharoof . 2000. Sweet potato demonstration trial. AGTEC. In brief. Publication of Department of Agriculture. March – April 2000.