J. F. Oblitas-Cruz, J. Cruz, J. M. Baas-López, and B. Escobar-Morales, “Biochar characterization obtained from Citrus aurantifolia waste using Raman and FTIR spectroscopy coupled with principal component analysis”, LACCEI, vol. 1, no. 12, July 2025, doi: 10.18687/LACCEI2025.1.1.2066.