Cloud structure on the dark side of Venus

@article{Allen1984CloudSO,
  title={Cloud structure on the dark side of Venus},
  author={David A. Allen and J. W. Crawford},
  journal={Nature},
  year={1984},
  volume={307},
  pages={222-224}
}
Observations of the dark side of the planet Venus at infrared wavelengths between 1.5 and 2.5 µm have shown it to be anomalously bright in portions of this waveband, and to exhibit structured cloud patterns whose rotation period is longer than that of any other clouds.