1. Allen R, Pereira LS, Raes D, Smith M (1998a) Chapter 2 - FAO penman-Monteith equation Crop evapotranspiration - guidelines for computing crop water requirements - FAO irrigation and drainage paper. FAO, Rome
2. Allen RG, Pereira LS, Raes D, Smith M (1998b) Crop evapotranspiration: guidelines for computing crop water requirements-FAO irrigation and drainage paper 56. FAO Irrigation and Drainage 1:326
3. Allen RG, Willardson LS, Frederiksen H (1997) Water use definitions and their use for assessing the impacts of water. Conservation sustainability irrigation in areas of water scarcity and drought. FAO Irrigat Draina 23:8
4. Andraski TW, Bundy LG, Brye KR (2000) Crop management and corn nitrogen rate effects on nitrate leaching. J Environ Q 29:1095–1103
5. Angel JR, Widhalm M, Todey D, Massey R, Biehl L (2017) The U2U corn growing degree day tool: Tracking corn growth across the US Corn Belt. Climate Risk Management 15:73–81