[Six-axis system with circular polarization: a simple method of determining the direction of cardiac vectors in the frontal plane; general description of the method].

@article{Zao1952SixaxisSW,
  title={[Six-axis system with circular polarization: a simple method of determining the direction of cardiac vectors in the frontal plane; general description of the method].},
  author={Z Z Zao and F S LARANJA},
  journal={Arquivos brasileiros de cardiologia},
  year={1952},
  volume={5 1},
  pages={82-93}
}