Curry, C.M., and M.A. Patten. 2016. Shadow of a doubt: premating and postmating isolating barriers in a temporally complex songbird (Passeriformes: Paridae) hybrid zone. Behavioral Ecology and Sociobiology 70(8):1171-1186. URL: https://link.springer.com/article/10.1007/s00265-016-2126-y
The rest of the fitness data and analysis are in the private OSF storage for [GIS Data][1].
[1]: https://osf.io/v2tfz/