1. Sequential Es at Sodankyla;Turunen;Geophysica,1975
2. Statistical behaviour of sporadic-E at Sodankyla 1958–1971;Turunen;Geophysica,1976
3. The diurnal variation of Es layer parameters at Sodankyla in summer 1973 based on ionospheric soundings utilizing low fixed gain;Turunen;Geophysica,1976
4. The long-term variation of Es layer parameters at Sodankyla 1958–1972;Turunen;Geophysica,1975
5. Sporadic E layer and magnetic activity at Sodankyla;Turunen;Geophysica,1976