@article{article3764699c,
title   = {Subbands , exchange and correlation effects on collective excitations in parabolic-quantum-well wires},
author = {Borges, A N and Leao, S A and Hipólito, Oscar},
year = {1997},
doi = {10.1103/physrevb.55.4680},
journal   = {Physical Review B}
}