F. Celis, C. Tirapegui, M. García, A. Aracena, Álvaro E. Aliaga, and M. Campos-Vallette, “IDENTIFICATION OF COEXISTING INDIGO SPECIES IN AN ANCIENT GREEN THREAD USING DIRECT PLASMON-ENHANCED RAMAN SPECTROSCOPY”, JCCHEMS, vol. 65, no. 2, pp. 4798-4803, Jul. 2020.