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(Research report / Forskningsrapport, 1985)
(Research report / Forskningsrapport, 1970)
(Research report / Forskningsrapport, 1963)
(Research report / Forskningsrapport, 1963)
(Research report / Forskningsrapport, 1964)
(Research report / Forskningsrapport, 1964)
(Research report / Forskningsrapport, 1973)
(Research report / Forskningsrapport, 1984)
(Research report / Forskningsrapport, 1973)
(Research report / Forskningsrapport, 1965)