@article{marcus_1957,  title={Notes on Aplysia},  volume={8},  ISSN={0373-5524},  url={https://doi.org/10.1590/S0373-55241957000100001},  DOI={10.1590/S0373-55241957000100001},  number={1-2},  journal={Boletim do Instituto Oceanográfico},  publisher={Instituto Oceanográfico da Universidade de São Paulo},  author={Marcus, Ernst},  year={1957},  pages={03–21} }