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R. Contreras, Ranney, T. G., Milla-Lewis, S. R., and Yencho, G. C., Investigating parentage and hybridity of three azaleodendrons using AFLP analysis, HortSCience, vol. 42, no. 3, 2007.
J. D. Lattier and Contreras, R., Intraspecific, Interspecific, and Interseries Cross-compatibility in Lilac, Journal of the American Society for Horticultural Science, vol. 142, no. 4, pp. 279 - 288, 2017.
R. Contreras, Ruter, J. M., Conner, J., Zeng, Y., and Ozias-Akins, P., Interspecific hybridization in Tecoma Juss. (Bignoniaceae): Confirmation of hybridity using GISH and morphology. 2011.
R. Contreras and Ruter, J. M., Induced polyploidy in Japanese cedar, Proc. 55th Ann. SNA Res. Conf., vol. 55:25-29. 2010.
J. A. Schulze and Contreras, R., In Vivo Chromosome Doubling of Prunus lusitanica and Preliminary Morphological Observations, HortScience, vol. 52, no. 3, pp. 332 - 337, 2017.
J. A. Schulze, Lattier, J. D., and Contreras, R., In vitro germination of immature Prunus lusitanica seed, HortScience, vol. 52, no. 8, 2017.
R. Contreras and Meneghelli, L., In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’. 2013.
R. Contreras and Meneghelli, L., In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’ and ‘Schipkaensis’, HortScience, vol. 51, no. 12, pp. 1463 - 1466, 2016.
R. Contreras and Lattier, J. D., Improving a garden classic., Digger, pp. 47-50, 2014.
J. D. Lattier, Chen, H., and Contreras, R., Improved Method of Enzyme Digestion for Root Tip Cytology, HortScience, vol. 52, no. 7, pp. 1029 - 1032, 2017.
B. M. Schwartz, Contreras, R., Harris-Schultz, K. R., and Raymer, P. L., Identification or Creation of a Putative Triploid Seashore Paspalum. 2012.
J. D. Lattier and Contreras, R., Hybridization Studies in Lilacs, Proc. 59th Ann. SNA Res. Conf. 59:229-234. 2014.