1. Assessment of chop length of herbage;Gale;Dept. Note DN/MH/848/07009, Natn. Inst. agric. Engng, Silsoe,1978
2. Determination of particle length in cobs and wafers;Møller;Trans. Am. Soc. agric. Engrs,1975
3. Ein Verfahren zur Bestimmung der Halmlange mit Hilfe eines Schwingsiebes;Orth;Grundl. Landtech.,1975
4. Chop length of herbage;Sharp;Note No. 142/1903, Natn. Inst. agric. Engng, Silsoe,1970
5. The grading accuracy of the N.I.A.E. chop lenght analyser;Goodfellow,1980