@misc{W2030216404,
  author = {Benjamin Y. H. Liu and Richard C. Jordan},
  title = {The interrelationship and characteristic distribution of direct, diffuse and total solar radiation},
  year = {1960},
  howpublished = {Solar Energy},
  doi = {https://doi.org/10.1016/0038-092x(60)90062-1}
}