^Tonkin E, Hagan DM, Li W, Strachan T (Oct 2002). "Identification and characterisation of novel mammalian homologues of Drosophila polyhomeoticpermits new insights into relationships between members of the polyhomeotic family". Hum Genet. 111 (4–5): 435–442. doi:10.1007/s00439-002-0814-3. PMID12384788. S2CID22192470.