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来源: nobelprize.org, nobelmuseum.se, kva.se, loc.gov, sverigesradio.se/history, kb.se (National Library of Sweden), vitterhetsakad.se (Royal Swedish Academy of Letters), karolinska.se, nobelpeacecenter.org, riksdagen.se, archive.org, bl.uk (British Library), europeana.eu, jstor.org