J. A. Luna López, J. L. Sosa Sánchez, S. Granillo Martínez, J. Carrillo López, J. F. Flores Gracia, and J. Martínez Juárez, “Structural and optical properties of a new soluble erbium (III) octa-substituted bis-phthalocyanine complex”, Superficies y Vacio, vol. 27, no. 4, p. 110, Dec. 2014.