Colour blindness in Finland. 1. Frequency of protans and deutans. 2. Family studies on minor deviations of the normal mid matching point using the anomalscope.

@article{Forsius1968ColourBI,
  title={Colour blindness in Finland. 1. Frequency of protans and deutans. 2. Family studies on minor deviations of the normal mid matching point using the anomalscope.},
  author={Henrik Forsius and Aldur W. Eriksson and Johan Fellman},
  journal={Acta ophthalmologica},
  year={1968},
  volume={46 3},
  pages={542-52}
}