BibTex format
@article{Stelle:2013:10.1007/978-3-642-33036-0_1,
author = {Stelle, KS},
doi = {10.1007/978-3-642-33036-0_1},
journal = {Lecture Notes in Physics},
pages = {3--30},
title = {String Theory, Unification and Quantum Gravity},
url = {http://dx.doi.org/10.1007/978-3-642-33036-0_1},
volume = {99999999},
year = {2013}
}