@inproceedings{robison_schuler_jervis_cox_birks_2004, title={Individual tree release and enrichment planting in young natural upland hardwoods}, booktitle={Proceedings of the 12th Biennial Southern Silvicultural Research Conference : Biloxi, Mississippi, February 24-28, 2003}, publisher={Asheville, NC : U.S. Dept. of Agriculture, Forest Service, Southern Research Station}, author={Robison, D. J. and Schuler, J. L. and Jervis, L. and Cox, J. L. and Birks, P. J.}, year={2004} }
 @inproceedings{robison_hascoat_birks_cunningham_winski_1999, title={Optimizing sweetgum rooted cutting technology}, volume={25}, booktitle={Proceedings of the 25th Southern Forest Tree Improvement Conference}, author={Robison, D. and Hascoat, N. and Birks, P. and Cunningham, M. and Winski, P.}, year={1999}, pages={223} }
 @inproceedings{birks_robison_1999, title={Screening sweetgum seedling families for growth and stress response}, volume={25}, booktitle={Proceedings of the 25th Southern Forest Tree Improvement Conference}, author={Birks, P. and Robison, D.}, year={1999}, pages={36–39} }
 @inproceedings{robison_chang_birks_1999, title={The Hardwood Research Cooperative program at NC State University}, ISBN={0939970813}, booktitle={Proceedings of Portland '99, pioneering new trails : proceedings of the Society of American Foresters 1999 National Convention, Portland, Oregon, September 11-15, 1999.}, author={Robison, D. and Chang, S. and Birks, P.}, year={1999}, pages={558–559} }