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(Research report / Forskningsrapport, 1979)
(Research report / Forskningsrapport, 1971)
(Research report / Forskningsrapport, 1973)
(Research report / Forskningsrapport, 1974)
(Research report / Forskningsrapport, 1974)
(Research report / Forskningsrapport, 1973)
(Research report / Forskningsrapport, 1972)
(Research report / Forskningsrapport, 1976)
(Research report / Forskningsrapport, 1975)
(Research report / Forskningsrapport, 1973)