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(Research report / Forskningsrapport, 1977)
(Research report / Forskningsrapport, 1977)
(Research report / Forskningsrapport, 1975)
(Research report / Forskningsrapport, 1975)
(Research report / Forskningsrapport, 1975)
(Research report / Forskningsrapport, 1974)
(Research report / Forskningsrapport, 1973)