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The Marbles test. A test for small groups.
Usandivaras RJ, Grimson WR, Hammond H, Issaharoff E, Romanos D. Usandivaras RJ, et al. Among authors: romanos d. Arch Gen Psychiatry. 1967 Jul;17(1):111-8. doi: 10.1001/archpsyc.1967.01730250111016. Arch Gen Psychiatry. 1967. PMID: 4952156 No abstract available.