Saynes, V., Delgado, J.A., Tebbe, C., Etchevers, J.D., Lapidus, D., Otero-Arnaiz, A. 2014. Use of the new Nitrogen Index tier zero to assess the effects of nitrogen fertilizer on N2O emissions from cropping systems in Mexico. Ecological Engineering. 73:778-785.
Delgado, J.A., Kowalski, K.D., Tebbe, C.R. 2013. The first nitrogen index app for mobile devices: using portable technology for smart agricultural management. Computers and Electronics in Agriculture. 91:121-123.