That Principia mathematica, first edition, has a predicative interpretation after all

@article{Leblanc1975ThatPM,
  title={That Principia mathematica, first edition, has a predicative interpretation after all},
  author={Hugues Leblanc},
  journal={J. Philosophical Logic},
  year={1975},
  volume={4},
  pages={67-70}
}