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4. Piotrowski, Z. The M, FM, and m responses as indicators of changes in personality. Rorschach Res. Exch., 1:148–156, 1937.
5. Oberholzer, H.: Zur Differentialdiagnose psychiascher Folgezustände nach Schädeltraumen mittels des Rorschachschen Formdeutversuchs. Z. Neur., 136:596–629, 1931.