BibTex format
@article{Forcella:2011:10.1016/j.nuclphysb.2011.01.002,
author = {Forcella, D and Hanany, A and Troost, J},
doi = {10.1016/j.nuclphysb.2011.01.002},
journal = {NUCLEAR PHYSICS B},
pages = {212--225},
title = {The covariant perturbative string spectrum},
url = {http://dx.doi.org/10.1016/j.nuclphysb.2011.01.002},
volume = {846},
year = {2011}
}