1. Solar Radiation During Cloudless Days;Fritz;Heating and Ventilation,1949
2. Average Solar Radiation in the United States;Fritz;Heating and Ventilation,1949
3. Solar Radiation and the Duration of Sunshine;Black;Quarterly Journal Royal Meterological Society,1954
4. The Distribution of Solar Radiation Over the Earth's Surface;Black;Arch. Met. Geoph. Biokl. B. Bd,1956
5. Average Insolation in Canada During Cloudless Days;Mateer;Canadian Journal of Technology,1955