Morris C, Courtay C, Geurts van Kessel A, ten Hoeve J, Heisterkamp N, Groffen J (Apr 1993). "Localization of a gamma-glutamyl-transferase-related gene family on chromosome 22". Hum Genet. 91 (1): 31–6. doi:10.1007/bf00230218. PMID8095916. S2CID21440198.
Morris C, Courtay C, Geurts van Kessel A, ten Hoeve J, Heisterkamp N, Groffen J (Apr 1993). "Localization of a gamma-glutamyl-transferase-related gene family on chromosome 22". Hum Genet. 91 (1): 31–6. doi:10.1007/bf00230218. PMID8095916. S2CID21440198.
Morris C, Courtay C, Geurts van Kessel A, ten Hoeve J, Heisterkamp N, Groffen J (Apr 1993). "Localization of a gamma-glutamyl-transferase-related gene family on chromosome 22". Hum Genet. 91 (1): 31–6. doi:10.1007/bf00230218. PMID8095916. S2CID21440198.