@article{schultheis_walters_adams_1999, title={In-row plant spacing and date of harvest of 'Beauregard' sweetpotato affect yield and return on investment}, volume={34}, number={7}, journal={HortScience}, author={Schultheis, J. R. and Walters, S. A. and Adams, D. E.}, year={1999}, pages={1229–1233} }