How qualitative spectral information can improve soil profile classification? - Marques, Karina P. P; Rizzo, Rodnei; Dotto, André Carnieletto; Souza, Arnaldo Barros e; Mello, Fellipe A. O; Neto, Luiz G. M; Anjos, Lúcia Helena Cunha dos; Demattê, José Alexandre Melo (Journal of Near Infrared Spectroscopy, 2019)