1. 3. T. Alberda, and L. Sibma, 1962 . Dry matter production and light interception of crop surfaces. 2. Relation between rate of growth and length of grass .Jaarb. Inst. biol. scheik. Onderz. LandbGewass. 1962pp.47 -58 .
2. 4. T. Alberda, and C. T. Wit. 1961 . Dry matter production and tight interception of crop surfaces. Uninterrupted growth of a grass sward .Jaarb. Inst. biol. scheik. Onderz. LandbGewass, 1961pp.37 -44 .
3. Effect of intensity of defoliation on regrowth of pasture