@article{kelley_danehower_bowman_1990, title={A colour scale for rapid measurement of relative pigment concentration in burley tobacco leaves}, volume={192}, number={5}, journal={Tobacco International}, author={Kelley, W. T. and Danehower, D. A. and Bowman, D. T.}, year={1990}, pages={35} }
 @article{kelley_bowman_1990, title={GENOTYPE AND TOPPING STAGE IN RELATION TO MATURITY IN BURLEY TOBACCO}, volume={82}, ISSN={["0002-1962"]}, DOI={10.2134/agronj1990.00021962008200060016x}, abstractNote={Abstract}, number={6}, journal={AGRONOMY JOURNAL}, author={KELLEY, WT and BOWMAN, DT}, year={1990}, pages={1107–1109} }