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Barr, M. L.; Bertram, E. G. (1949). "A Morphological Distinction between Neurones of the Male and Female, and the Behaviour of the Nucleolar Satellite during Accelerated Nucleoprotein Synthesis". Nature. 163 (4148): 676–7. Bibcode:1949Natur.163..676B. doi:10.1038/163676a0. PMID18120749.
Barr, M. L.; Bertram, E. G. (1949). "A Morphological Distinction between Neurones of the Male and Female, and the Behaviour of the Nucleolar Satellite during Accelerated Nucleoprotein Synthesis". Nature. 163 (4148): 676–7. Bibcode:1949Natur.163..676B. doi:10.1038/163676a0. PMID18120749.
Barr, M. L.; Bertram, E. G. (1949). "A Morphological Distinction between Neurones of the Male and Female, and the Behaviour of the Nucleolar Satellite during Accelerated Nucleoprotein Synthesis". Nature. 163 (4148): 676–7. Bibcode:1949Natur.163..676B. doi:10.1038/163676a0. PMID18120749.