@book{Nakajima_1980,
title={The Physics of Elementary Excitations},
ISBN={9783642814402},
ISSN={0171-1873},
url={http://dx.doi.org/10.1007/978-3-642-81440-2},
DOI={10.1007/978-3-642-81440-2},
journal={Springer Series in Solid-State Sciences},
publisher={Springer Berlin Heidelberg},
author={Nakajima,
Sadao and Toyozawa,
Yutaka and Abe,
Ryuzo},
year={1980} }