K. E. Tripp Tripp, K. E., Kroen, W. K., Peet, M. M., & Willits, D. H. (1992). Fewer whiteflies found on CO2-enriched greenhouse tomatoes with high C:N ratios. HortScience, 27(10), 1079. Tripp, K. E., Peet, M. M., Pharr, D. M., Willits, D. H., & Nelson, P. V. (1991). CO2-Enhanced Yield and Foliar Deformation among Tomato Genotypes in Elevated CO2 Environments. Plant Physiology, 96(3), 713–719. https://doi.org/10.1104/pp.96.3.713 Tripp, K. E., Peet, M. M., Willits, D. H., & Pharr, D. M. (1991). CO2-enhanced foliar deformation of tomato: Relationship to foliar starch concentration. Journal of the American Society for Horticultural Science, 116(5), 876.