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  author = {Chen Shen and Marko Jusup and Lei Shi and Zhen Wang and Matjaz Perc and Petter Holme},
  title = {Exit rights open complex pathways to cooperation},
  journal = {J. Roy. Soc. Interface},
  year = 2021,
}

@article{CTT100830294,
  author = {Lei Shi and Ivan Romić and Yongjuan Ma and Zhen Wang and Boris Podobnik and Harry Eugene Stanley and Petter Holme and Marko Jusup},
  title = {Freedom of choice adds value to public goods},
  journal = {Proceedings of the National Academy of Sciences of the United States of America, Proc. Natl. Acad. Sci. U. S. A, PNAS, PRONAS},
  year = 2020,
}