@article{luan_rohrbach_1989, title={Measurements of contact pressure during fruit impact}, number={89-6025}, journal={Paper (American Society of Agricultural Engineers)}, author={Luan, J. M. and Rohrbach, R. P.}, year={1989}, pages={24} }
 @article{luan_rohrbach_1989, title={Viscoelastic impact measurement using a dot-matrix transducer}, number={89-1601}, journal={Paper (American Society of Agricultural Engineers)}, author={Luan, J. M. and Rohrbach, R. P.}, year={1989}, pages={15} }