1. Dept Note SIN/482;LH Barr,1987
2. Bouman, A. and Bouma, J. (1983) The effect of the potato haulm on the haulm pulling efficiency. Agric. Engr, 38(1), 25–32.
3. Dept Note SIN/294;J Carruthers,1980
4. Eistob, R.H., Kirkland, J., McRae, D.C. and Fleming, J. (1990) Investigation of the factors which limit the efficiency of operation of roller grading tables. Abstracts of 11th Triennial Conference, Eur. Assoc. for Potato Res., Edinburgh, pp. 239–40.
5. Entz, M.H. and La Croix, L.J. (1983) A survey of planting accuracy of commercial potato planters. Am. Potato J., 60(8), 617–23.