@article{choi_nelson_1996, title={Developing a slow-release nitrogen fertilizer from organic sources: I. Using nonviable bacteria}, volume={121}, number={4}, journal={Journal of the American Society for Horticultural Science}, author={Choi, J.-M. and Nelson, P. V.}, year={1996}, pages={629} }
 @article{choi_nelson_1996, title={Developing a slow-release nitrogen fertilizer from organic sources: II. Using poultry feathers}, volume={121}, number={4}, journal={Journal of the American Society for Horticultural Science}, author={Choi, J.-M. and Nelson, P. V.}, year={1996}, pages={634} }
 @article{choi_nelson_1996, title={Developing a slow-release nitrogen fertilizer from organic sources: III. Isolation and action of a feather-degrading actinomycete}, volume={121}, number={4}, journal={Journal of the American Society for Horticultural Science}, author={Choi, J.-M. and Nelson, P. V.}, year={1996}, pages={639} }