1. On the origin of Es transparency;Bencze;INAG Bulletin,1983
2. Prediction of HF circuit availability;Bradley;Electronics Letters,1976
3. Variations in frequency of occurrence of sporadic-E, 1949–1959;Chadwick,1961
4. fbEs prediction method at midlatitudes;Giraldez,1975
5. Day-time sporadic-E blanketing frequency prediction;Giraldez,1979