Sultana, M. H., P. Lam-Po-Tang, H. Suyitno, and A. Soemantri. “Chromosomal Abnormalities in Mentally Retarded Boys Other Than Down’s Syndrome in Indonesian Special Schools”. Medical Journal of Indonesia, Vol. 5, no. 3, July 1996, pp. 123-7, doi:10.13181/mji.v5i3.858.