Sekhon, Priya Paul, Arijit Barman, Arghya Chattopadhyay and Nilimesh Mridha, Bhabani Prasad Mondal*, Bharpoor S. “VIS-NIR Reflectance Spectroscopy As an Alternative Method for Rapid Estimation of Soil Available Potassium”. Journal of the Indian Society of Soil Science, vol. 68, no. 3, Jan. 2021, https://epubs.icar.org.in/index.php/JISSS/article/view/109339.