@article{palmer_ranney_lynch_bir_2009, title={Crossability, cytogenetics, and reproductive pathways in Rudbeckia subgenus Rudbeckia}, volume={44}, DOI={10.21273/HORTSCI.44.1.44}, number={1}, journal={HortScience}, author={Palmer, I. E. and Ranney, T. G. and Lynch, N. P. and Bir, R. E.}, year={2009}, pages={44–48} }
 @article{bir_1999, title={Increasing rhododendron flowering}, volume={15}, number={11}, journal={Nursery Management & Production}, author={Bir, R. E.}, year={1999}, pages={31} }
 @article{bir_ranney_conner_1997, title={Carryover affects of sumagic treatments on Kalmia latifolia cultivars}, volume={42}, number={1997}, journal={Proceedings of Southern Nurserymen's Association Research Conference Annual Report}, author={Bir, R. E. and Ranney, T. G. and Conner, J. L.}, year={1997}, pages={330–331} }
 @article{bir_1996, title={Rooting stem cuttings of some eastern native rhododendrons}, volume={50}, number={2}, journal={American Rhododendron Society Journal}, author={Bir, R. E.}, year={1996}, pages={65} }
 @article{bir_1989, title={Spray water or let it drip?}, volume={169}, number={3}, journal={American Nurseryman}, author={Bir, R. E.}, year={1989}, pages={80} }