Castaño, V. M. and Shafer, M. W. (1989) “Microstructure of silica gels by transmission electron microscopy”, Revista Mexicana de Física, 36(3), pp. 400–406. Available at: https://rmf.smf.mx/ojs/index.php/rmf/article/view/2126 (Accessed: 5 July 2024).