R. Curl and B. , Potato harvester, U.S.Patent , No, p.4121667, 1978.

G. M. Hyde, R. E. Thornton, and D. W. Woodruff, Potato Harvester Performance with Automatic Chain-Load Control, Transactions of the ASAE, vol.26, issue.1, pp.19-22, 1983.
DOI : 10.13031/2013.33868

J. Welp, Potato harvester, U.S.Patent, No, p.4842076, 1989.

D. W. Woodruff, G. M. Hyde, and R. E. Thornton, A Preliminary Analysis of a High-Frequency Soil Riddling Device for Use on Potato Harvesters, Transactions of the ASAE, vol.27, issue.6, pp.1638-1642, 1984.
DOI : 10.13031/2013.33018

G. C. Misener, C. D. Mcleod, and L. P. Mcmillan, Improved Design for Soil Separation and Vine Removal Mechanisms on a Potato Harvester, Applied Engineering in Agriculture, vol.5, issue.4, pp.522-526, 1989.
DOI : 10.13031/2013.26555

R. Feller, E. Margolin, A. Zacharin, and H. Pasternak, Development of a Clod Separator for Potato Packing Houses, Transactions of the ASAE, vol.28, issue.4, pp.1019-1023, 1985.
DOI : 10.13031/2013.32380

S. Gan-mor, A. Zacharin, N. Gaili, R. Feller, and E. Margolin, Absorbing Stone Impact to Enable Separation from Potatoes, Transactions of the ASAE, vol.29, issue.6, pp.1526-1529, 1986.
DOI : 10.13031/2013.30348

A. M. Bouillon, Potato harvesting apparatus, U.S.Patent, No, p.4416334, 1983.

G. C. Misener and C. D. Mcleod, A resource efficient approach to potato-stone-clod separation, AMA Agric. Mech. Asia Afr. Lat. Am, vol.20, pp.33-36, 1989.

. Zhang, Yimin: Mechanical Vibration, 2007.