Rakhawy, Y., S. El Sayed, M. Askar, A. El Rashidi, A. El Bakry, M. El Batrawi, T. Gawad, O. El Hattab, S. Moussa, and Z. Halim,
"Reliability and Validity of a Local Classification of Schizophrenia ",
Egyptian Journal of Psychiatry , vol. 17, issue 1, pp. 183 – 192, 1994.