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(Freud 1920)

'When first discussed as "the process...which plays the largest part in our understanding of...other people"(Freud, 1920 p. 110, fn.2), a scientifically valid method of observation by which psychiatrists could gain understanding of the inner world of their patients, it was highly suspect." (OHARA 1997
Freud, S. (1920). Group psychology and the analysis of the ego. Standard Edition, 18, 110.