1. B. Deinum, 1966 : Influence of some climatological factors on the chemical composition and feeding value of herbage . Proc. X. Int. Grassl. Congr. Helsinki, 415 -418 .
2. B. Deinum, 1976 : Effect of age, leaf number and temperature on cell wall and digestibility of maize. Misc. Papers no. 12 (1976) Agric. Univ. Wageningen.