Unusual electronic ground state of a prototype cuprate: Band splitting of single -plane x C. Janowitz, R. Müller, L. Dudy, A. Krapf, R. Manzke, C. R. Ast and H. HöchstEurophys. Lett., 60 4 (2002) 615-621DOI: https://doi.org/10.1209/epl/i2002-00245-y