Varea, C., and A. Robledo. “Effect of Oxygen Pressure and Temperature on the Tetragonal-Orthorhombic Transition in a Model YBa2Cu3O7-Y”. Revista Mexicana De Física, vol. 33, no. 3, Jan. 1986, pp. 311-9, https://rmf.smf.mx/ojs/index.php/rmf/article/view/1936.