García-Fornaris, I., E. Govea-Alcaide, P. Muné, and R. Jardim. “Intergranular Properties of Uniaxially Pressed YBa$_2$Cu$_3$O$_{7-\delta}$ Ceramic Samples”. Revista Mexicana De Física, vol. 56, no. 1, Jan. 2010, pp. 40-0, https://rmf.smf.mx/ojs/index.php/rmf/article/view/3725.