@article{id_5612,
title = "LONG-WAVELENGTH COLLECTIVE EXCITATIONS OF CHARGE-CARRIERS IN HIGH-TC SUPERCONDUCTORS",
author = "N. Nucker, U. Eckern, J. Fink, P. Muller",
journal = "Physical Review B",
volume = "44",
year = "1991",
url = "http://dx.doi.org/10.1103/PhysRevB.44.7155",
}