@article{articlec81abb60,
title   = {Ring chromosome 7 in a man with multiple congenital anomalies and mental retardation},
author = {Koiffmann, Celia Priszkulnik and Diament, Aron Judka and Souza, D. H. and Wajntal, Anita},
year = {1990},
doi = {10.1136/jmg.27.7.462},
journal   = {Journal of Medical Genetics}
}