Sum Rules and Interlayer Conductivity of High-Tc Cuprates Basov, D. N. ; Woods, S. I. ; Katz, A. S. ; Singley, E. J. ; Dynes, R. C. ; Xu, M. ; Hinks, D. G. ; Homes, C. C. ; Strongin, M. Abstract Publication: Science Pub Date: January 1999 DOI: 10.1126/science.283.5398.49 Bibcode: 1999Sci...283...49B