Babacan-Yıldız, G., Işık, A.T., Ur-Özcelik, E., Aydemir, E., Ertaş, C., Çebi, M., Uysal, P., Gürsoy, E., Kolukısa, M., Çelebi, A ., "COST: Cognitive state test, a brief screening battery for Alzheimer's disease in illiterate and literate patients", European Journal of Neurology, 19, 533-533, 2012.