Imakawa, K.; Nakagawa, S. (2017). 〈The Phylogeny of Placental Evolution Through Dynamic Integrations of Retrotransposons〉. 《Molecular Biology of Placental Development and Disease》. Progress in Molecular Biology and Translational Science 145. 89–109쪽. doi:10.1016/bs.pmbts.2016.12.004. ISBN978-0-12-809327-6. PMID28110755.
Imakawa, K.; Nakagawa, S. (2017). 〈The Phylogeny of Placental Evolution Through Dynamic Integrations of Retrotransposons〉. 《Molecular Biology of Placental Development and Disease》. Progress in Molecular Biology and Translational Science 145. 89–109쪽. doi:10.1016/bs.pmbts.2016.12.004. ISBN978-0-12-809327-6. PMID28110755.