Rosner, H., Drechsler, S. L., Fuchs, G., Handstein, A., Wälte, A., & Müller, K. H. (2003). Electronic Structure and Aspects of Unconventional Superconductivity in NaxCoO2· yH2O. Brazilian Journal of Physics, 33(4), 718-722. doi:10.1590/S0103-97332003000400016.