@article{harris_rohrbach_1993, title={Ice refrigerant heat exchanger}, number={93-6013}, journal={Paper (American Society of Agricultural Engineers)}, author={Harris, D. and Rohrbach, R. P.}, year={1993}, pages={27} }
 @article{harris_rohrbach_mizrach_1989, title={Muscadine grape hedge pruner}, number={89-1594}, journal={Paper (American Society of Agricultural Engineers)}, author={Harris, D. and Rohrbach, R. P. and Mizrach, A.}, year={1989}, pages={17} }