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2. Alberda, Th. (1966) The influence of reserve substances on dry-matter production after defoliation. Proc. 10th Int. Grassland Congr., Helsinki, pp. 140–7.
3. Alberda, Th. (1970) The influence of carbohydrate reserves on respiration, photosynthesis and dry matter production of intact plants. Proc. 11th Int. Grassland Congr., Queensland, pp. 517–22.
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5. Alberda, Th. and Sibma, L. (1982) The influence of length of growing period, nitrogen fertilization and shading on tillering of perennial ryegrass (Lolium perenne L.). Neth. J. Agric. Sci., 30, 127–35.