R. K. Grizotto, A. N. Martins, G. B. de Souza, M. D. M. Oliveira, A. L. M. Martins, and E. C. P. Gonçalves, “Evaluation of dry rubber content of natural rubber sheets by near-infrared spectroscopy: benchtop versus portable instruments”, Semina: Ciênc. Agrár., vol. 47, no. 2, pp. 357–380, Aug. 2026.