title: Psychic equivalence principle.
authors.forename: K J
authors.initials: KJ
authors.lastname: Epstein
mesh_terms: D004532:Ego; D006801:Humans; D011574:Psychoanalytic Theory; D011575:Psychoanalytic Therapy / Q000379:methods*; D012043:Regression, Psychology; D014473:Unconscious, Psychology