@article{albuquerque_fleury_fleury_2011,  title={Vertical integration in service industries: an exploratory study at the healthcare industry in São Paulo},  volume={21},  ISSN={0103-6513},  url={https://doi.org/10.1590/S0103-65132011005000015},  DOI={10.1590/S0103-65132011005000015},  number={1},  journal={Production},  publisher={Associação Brasileira de Engenharia de Produção},  author={Albuquerque, Gustavo M. de and Fleury, Maria Tereza Leme and Fleury, André Leme},  year={2011},  month={Jan},  pages={39–52} }