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Chamorro, Susana; Heleno, Ruben; Olesen, Jens M.; McMullen, Conley K. & Traveset, Anna (1 November 2012), "Pollination patterns and plant breeding systems in the Galápagos: a review", Annals of Botany, 110 (7): 1489–1501, doi:10.1093/aob/mcs132, PMC3489146, PMID22691541
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Vargas, Pablo; Rumeu, Beatriz; Heleno, Ruben H.; Traveset, Anna & Nogales, Manuel (25 March 2015), "Historical Isolation of the Galápagos Carpenter Bee (Xylocopa darwini) despite Strong Flight Capability and Ecological Amplitude", PLOS ONE, 10 (3): e0120597, Bibcode:2015PLoSO..1020597V, doi:10.1371/journal.pone.0120597, PMC4373804, PMID25807496
Chamorro, Susana; Heleno, Ruben; Olesen, Jens M.; McMullen, Conley K. & Traveset, Anna (1 November 2012), "Pollination patterns and plant breeding systems in the Galápagos: a review", Annals of Botany, 110 (7): 1489–1501, doi:10.1093/aob/mcs132, PMC3489146, PMID22691541
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Rasmussen, Claus; Carríon, Ana L.; Castro-Urgal, Rocío; Chamorro, Susana; Gonzalez, Victor H.; Griswold, Terry L.; Herrera, Henri W.; McMullen, Conley K.; Olesen, Jens M. & Traveset, Anna (July 2012), "Megachile timberlakei Cockerell (Hymenoptera: Megachilidae): Yet another adventive bee species to the Galápagos Archipelago", The Pan-Pacific Entomologist, 88 (1): 98–102, doi:10.3956/2012-04.1, S2CID85790928
Schluter, Dolph (1 January 1986), "Character Displacement between Distantly Related Taxa? Finches and Bees in the Galapagos", The American Naturalist, 127 (1): 95–102, doi:10.1086/284470, S2CID83906633