Seabright M, Gregson N, Mould S
Hum Genet. 1976 Dec 15;34(3):323-5. doi: 10.1007/BF00295299.
This report describes the third case of a complete trisomy 9 in a liveborn infant. A tentative explanation for the origin of a "very large" h-segment which was not present in either parent of the proposita is put forward.