Comparative study on the use of three different near infrared spectroscopy recording methodologies for varietal discrimination of walnuts - Nogales-Bueno, Julio; Feliz, Luis; Baca-Bocanegra, Berta; Hernandéz-Hierro, José Miguel; Heredia, Francisco José; Mota Barroso, João Manuel; Rato, Ana Elisa (2020)