Papalopulu N, Kintner C (1993). "Xenopus Distal-less related homeobox genes are expressed in the developing forebrain and are induced by planar signals". Development. 117 (3): 961–75. doi:10.1242/dev.117.3.961. PMID8100768.
Papalopulu, Nancy; Kintner C. (1996). "A posteriorising factor, retinoic acid, reveals that anteroposterior patterning controls the timing of neuronal differentiation in Xenopus neuroectoderm". Development. 122 (11): 3409–3418. doi:10.1242/dev.122.11.3409. PMID8951057.
Papalopulu N, Kintner C (1993). "Xenopus Distal-less related homeobox genes are expressed in the developing forebrain and are induced by planar signals". Development. 117 (3): 961–75. doi:10.1242/dev.117.3.961. PMID8100768.
Papalopulu, Nancy; Kintner C. (1996). "A posteriorising factor, retinoic acid, reveals that anteroposterior patterning controls the timing of neuronal differentiation in Xenopus neuroectoderm". Development. 122 (11): 3409–3418. doi:10.1242/dev.122.11.3409. PMID8951057.