@article{hutchinson2015penalized,
  title={Penalized likelihood methods improve parameter estimates in occupancy models},
  author={Hutchinson, Rebecca A and Valente, Jonathon J and Emerson, Sarah C and Betts, Matthew G and Dietterich, Thomas G},
  journal={Methods in Ecology and Evolution},
  volume={6},
  number={8},
  pages={949--959},
  year={2015},
  publisher={Wiley Online Library}
}