@article{amano_nakaoka_imataka_fujii_1987, 
  title={Mental stress-induced negative U waves in hypertensives}, 
  volume={19}, 
  DOI={10.11281/shinzo1969.19.3_307}, 
  number={3}, 
  publisher={Japan Heart Foundation}, 
  author={Amano, Masao and Nakaoka, Hideaki and Imataka, Kouji and Fujii, Jun}, 
  year={1987}
  }