Wheat

Gilmanov, Tagir G, Bruce K Wylie, Larry L Tieszen, Tilden P Meyers, Vern S Baron, Carl J Bernacch, David P Billesbach, George G Burba, Marc L Fischer, Aaron J Glenn, Niall P Hanan, Jerry L Hatfield, Mark W Heuer, Steven E Hollinger, Daniel M Howard, Roser Matamala, John H Prueger, Mario Tenuta, and David G Young. "CO₂ uptake and ecophysiological parameters of the grain crops of midcontinent North America: Estimates from flux tower measurements." Agriculture, Ecosystems & Environment 164 (2013) 162–175.

Fischer, Marc L, David P Billesbach, Joseph A Berry, William J Riley, and Margaret S Torn. "Spatiotemporal Variations in Growing Season Exchanges of CO₂, H₂O, and Sensible Heat in Agricultural Fields of the Southern Great Plains." Earth Interact 11.17 (2007) 1–21.

Kobayashi, Reiko, Robert A Okamoto, Randy L Maddalena, and Norman Y Kado. Field Measurement of polycyclic aromatic hydrocarbons in wheat grain grown in Sacramento and San Joaquin Valleys, California. Lawrence Berkeley National Laboratory, 2006.