1. Camellias and sulphur-coated urea;Ackerman;Am. Camellia Yearb.,1975
2. Factors affecting the rate of release of fertilizers from capsules;Ahmed;Agron. J.,1963
3. Coated and other slow-release fertilizers for forages;Allen,1974
4. Urea-form — a nitrogenous fertilizer of controlled availability: experiment with turf grasses;Armiger;J. Am. Soc. Agron.,1948