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title = {{An Expanded Rossi X-Ray Timing Explorer Survey of X-Ray Variability in Seyfert 1 Galaxies}},  journal = {{ApJ}},  }  @article{Caballero_Garcia_2012,  doi = {10.1051/0004-6361/201117974},  url = {http://dx.doi.org/10.1051/0004-6361/201117974},  year = {2012},  month = {jan},  publisher = {{EDP} Sciences},  volume = {537},  pages = {A87},  author = {M. D. Caballero-Garcia and I. E. Papadakis and F. Nicastro and M. Ajello},  title = {{Hard X-ray spectral variability of the brightest Seyfert {AGN} in the Swift /{BAT} sample}},  journal = {Astronomy {\&} Astrophysics},  }