1. Baille, A. (1993). Artificial light sources for crop production. In C. Varlet-Grancher et al. (Eds.), Crop Structure and Light Microclimate (pp. 107–120). Paris: Institut National de la Recherche Agronomique.
2. Belanger, M. C., Viau, A. A., Samson, G., & Chamberland, M. (2005). Determination of a multivariate indicator of nitrogen imbalance (MINI) in potato using reflectance and fluorescence spectroscopy. Agronomy Journal, 97, 1515–1523.
3. Bredemeier, C., & Schmidhalter, U. (2005). Laser-induced chlorophyll fluorescence sensing to determine biomass and nitrogen uptake of winter wheat under controlled environment and field condition. In J. V. Stafford (Eds.), Proceedings of the 5th European Conference on Precision Agriculture (pp. 273–280). The Netherlands: Wageningen Academic Publishers.
4. Ehlert, D., & Schmerler, J. (2001). Sensor-based real-time application of late nitrogen fertilizer in winter-wheat. In G. Grenier & S. Blackmore (Eds.), Proceedings of the 3rd European Conference on Precision Agriculture (pp. 911–916). Agro: Ecole Nationale Superior Agronomique, Montpellier.
5. Felton, W. L., & McCloy, R. (1992). Spot Spraying. Agricultural Engineering, 73, 9–12.