1. Moby-Dick; or, the whale;Melville,1851
2. The idea of a presence;Critchley;Acta Psychiatr Neurol Scand,1955
3. Über leibhaftige Bewusstheiten (Bewusstheitstäuschungen), ein psychopathologisches Elementarsymptom;Jaspers;Zeitschrift für Pathopsychologie,1913
4. The varieties of religious experience: a study in human nature: being the Gifford Lectures on natural religion delivered at Edinburgh in 1901–1902;James,1902
5. Unilaterally felt “presences”: the neuropsychiatry of one's invisible doppelgänger;Brugger;Neuropsychiatry Neuropsychol Behav Neurol,1996