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Sumiyoshi, C.; Sumiyoshi, T.; Nohara, S.; Yamashita, I.; Matsui, M.; Kurachi, M.; Niwa, S. (Apr 2005). "Disorganization of semantic memory underlies alogia in schizophrenia: an analysis of verbal fluency performance in Japanese subjects". Schizophr Res. 74 (1): 91–100. doi:10.1016/j.schres.2004.05.011. PMID15694758.