@article{cruz_1981,  title={In memoriam: Ellen Fortlage Luedemann (*1911-†1981)},  volume={30},  ISSN={0373-5524},  url={https://doi.org/10.1590/S0373-55241981000100001},  DOI={10.1590/S0373-55241981000100001},  number={1},  journal={Boletim do Instituto Oceanográfico},  publisher={Instituto Oceanográfico da Universidade de São Paulo},  author={Cruz, Andre Ricciardi},  year={1981},  pages={i–ii} }