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Adaptation of the respiratory system to flight in birds(Aves)

I am doing a seminar on the adaptation of the bird respiratory system to flight, but I am having some trouble finding journals that are useful to me. I need to find a minimum of 3 primary resources. I was just wondering if someone could help me find some.

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Attached I am sending abstracts of papers that could be useful. The first three are review papers. As morphological and physiological ...