1. Mechanical cherry harvesting;Markwardt;Trans. ASAE,1964
2. Mechanical cherry harvesting;Markwardt;Trans. ASAE,1964
3. Barnes, K. K.Detachment characteristics of lemons. ASAE Paper 68-121. ASAE, St. Joseph, Michigan
4. Tennes, B. R.; Levin, J. H.; Stout, B. A.Sweet cherry properties useful for designing harvesting and handling equipment. ASAE Paper 68-348, ASAE, St. Joseph, Michigan
5. Die Mechanisierung der Ernte von Stein-und Strauchbeerenobst;Graf v. Hardenberg;KTL-Berichte über Landtechnik,1967