1. Abraham, K.: Notes on the psychoanalytic investigation and treatment of manic depressive insanity and allied conditions, in Selected Papers on Psychoanalysis, pp. 137–156. New York: Basic Books Inc. 1960.
2. Freud, S.: Mourning and melancholia, in Complete Psychologie Works of Sigmund Freud, Standard edition, Vol. 14, pp. 243–258. London: Hogarth Press 1955.
3. Balint, M.: New beginning and the paranoid and the depressive Syndromes. Int. J. Psychoanal. 33, 214–224(1952).
4. Bibring,E.: The mechanism of depression. In: Greenacre, P. (Ed.): Affective Disorders, pp. 13–48. New York: International University Press 1953.
5. Dollard, J., Doob, L., Miller, N. et al: Frustration and Aggression. New Häven, Conn.: Yale University Press 1939.