@article{nitrini_1987,  title={Elementary motor perseveration in early diagnosis of progressive supranuclear palsy},  volume={45},  ISSN={0004-282X},  url={https://doi.org/10.1590/S0004-282X1987000100004},  DOI={10.1590/S0004-282X1987000100004},  number={1},  journal={Arquivos de Neuro-Psiquiatria},  publisher={Academia Brasileira de Neurologia - ABNEURO},  author={Nitrini, Ricardo},  year={1987},  month={Mar},  pages={29–32} }