I. S. Primdahl

• Occurrences of the Polar slant E condition - SEC at Narssarssuaq, Godhavn, Thule 1980
• Occurrences of the polar slant E condition--SEC at Narssarssuaq, Godhavn, Thule, 1978
• Occurrences of the polar slant E condition--SEC at Narssarssuaq, Godhavn, Thule, 1982