@article{backes_backes_dalcin_erdmann_2012,  title={The nursing care system from a Luhmannian perspective},  volume={20},  ISSN={0104-1169},  url={https://doi.org/10.1590/S0104-11692012000500008},  DOI={10.1590/S0104-11692012000500008},  number={5},  journal={Revista Latino-Americana de Enfermagem},  publisher={Escola de Enfermagem de Ribeirão Preto / Universidade de São Paulo},  author={Backes, Dirce Stein and Backes, Marli Stein and Dalcin, Camila Biazus and Erdmann, Alacoque Lorenzini},  year={2012},  month={Sep},  pages={873–879} }