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APA Citation
Wu, P., Zuo, H., Sun, G., Wu, D., Salomon, B., Hu, Q., & Dong, Z. (n.d.). comparison of gene flow among species that occur within the same geographic locations versus gene flow among populations within species reveals introgression among several Elymus species. Journal of systematics and evolution, 54(2), 152–161. http://access.bl.uk/ark:/81055/vdc_100031255562.0x000008