@article{mitchell_1987,  title={Antigenic structure and the induction of different immune responses to parasites},  volume={82},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02761987000500013},  DOI={10.1590/S0074-02761987000500013},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={Mitchell, Graham F.},  year={1987},  month={Nov},  pages={324–335} }