Preparation and characterization of sol–gel silica based neutral optical density coatings by the addition of graphite particles by Almaral-Sanchez, J.L, Alvarez-Quintana, J, Araujo-Andrade, C, Calderón-Guillén, J.A, Carrillo-Esquivel, H, Elizalde-Peña, E.A, Flores-Ramı́rez, N, Garcia-Pastor, F.A, Gomez-Guzman, O, Licea-Jiménez, L, Meneses-Rodrı́guez, D, Peña-Hernández, A.E, Pérez-Garcı́a, S.A, Rubio-Avalos, J.C, Salazar-Flores, A, Talavera-Ortega, M, Vazquez-Garcı́a, G, Vázquez-Santoyo, L.D, González-Hernández, J

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