@article{maia_morais_2016,  title={Boundary Line Model to Estimate the Nutrient Sufficiency Range in Muskmelon Leaves},  volume={40},  ISSN={0100-0683},  url={https://doi.org/10.1590/18069657rbcs20160033},  DOI={10.1590/18069657rbcs20160033},  journal={Revista Brasileira de Ciência do Solo},  publisher={Sociedade Brasileira de Ciência do Solo},  author={Maia, Celsemy Eleutério and Morais, Elis Regina Costa de},  year={2016},  pages={e0160033} }