A comparative study on application of computer vision and fluorescence imaging spectroscopy for detection of huanglongbing citrus disease in the USA and Brazil - Wetterich, Caio B.; Kumar, Ratnesh; Sankaran, Sindhuja; Belasque Júnior, José; Ehsani, Reza; Marcassa, Luís Gustavo (Journal of Spectroscopy, 2013)