@article{nolte_weiffen_2021,  title={How regional organizations cope with recurrent stress: the case of South America},  volume={64},  ISSN={0034-7329},  url={https://doi.org/10.1590/0034-7329202100206},  DOI={10.1590/0034-7329202100206},  number={2},  journal={Revista Brasileira de Política Internacional},  publisher={Centro de Estudos Globais da Universidade de Brasília},  author={Nolte, Detlef and Weiffen, Brigitte},  year={2021},  pages={e006} }