@article{pacheco_2015,  title={What Expands in an Expanding Universe?},  volume={87},  ISSN={0001-3765},  url={https://doi.org/10.1590/0001-3765201520140650},  DOI={10.1590/0001-3765201520140650},  number={4},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={PACHECO, JOSÉ A. DE FREITAS},  year={2015},  month={Oct},  pages={1915–1927} }