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@ARTICLE{2015arXiv150700992M,  author = {{Middleton}, H. and {Del Pozzo}, W. and {Farr}, W.~M. and {Sesana}, A. and {Vecchio}, A.},  title = {{Astrophysical constraints on massive black hole binary evolution from Pulsar Timing Arrays}},  journal = {ArXiv e-prints},  archiveprefix = {arXiv},  eprint = {1507.00992},  keywords = {Astrophysics - Cosmology and Nongalactic Astrophysics},  year = {2015},  month = {jul},  adsurl = {http://adsabs.harvard.edu/abs/2015arXiv150700992M},  adsnote = {Provided by the SAO/NASA Astrophysics Data System},  }  @article{Middleton_2015,  doi = {10.1093/mnrasl/slv150},  url = {http://dx.doi.org/10.1093/mnrasl/slv150},