@article { 1967,
	title = {Gravitational Waves from Abelian Gauge Fields and Cosmic Strings at Preheating},
	volume = {D82},
	year = {2010},
	pages = {083518},
	publisher = {Phys.Rev.},
	address = {Phys.Rev. D82 (2010) 083518 },
	URL = {http://arxiv.org/abs/arXiv:1006.0217},
	author = {Jean-Francois Dufaux and Daniel G. Figueroa and Juan Garcia-Bellido}
}