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(Research report / Forskningsrapport, 1963)
(Research report / Forskningsrapport, 1964)
(Research report / Forskningsrapport, 1964)
(Research report / Forskningsrapport, 1965)
(Research report / Forskningsrapport, 1965)
(Research report / Forskningsrapport, 1967)
(Research report / Forskningsrapport, 1966)