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Nilsen, Håvard Friis (2013). "Resistance in therapy and war: Psychoanalysis before and during the Nazi occupation of Norway 1933–45". The International Journal of Psychoanalysis (in German). 94 (4): 725–746. doi:10.1111/1745-8315.12107. ISSN1745-8315. PMID23924332. S2CID30412960.
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Nilsen, Håvard Friis (2013). "Resistance in therapy and war: Psychoanalysis before and during the Nazi occupation of Norway 1933–45". The International Journal of Psychoanalysis (in German). 94 (4): 725–746. doi:10.1111/1745-8315.12107. ISSN1745-8315. PMID23924332. S2CID30412960.