Martin DE, Lopez Jr. JD, Lan Y. Laboratory evaluation of the GreenSeeker handheld optical sensor to variations in orientation and height above canopy. Int J Agric & Biol Eng [Internet]. 2012 Mar. 26 [cited 2026 Jan. 27];5(1):43-7. Available from: https://ijabe.org/index.php/ijabe/article/view/572