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Any in-depth, comprehensive studies on the avian respiratory complex?

 Dear all,

There seems to be many views on the nature of the avian respiratory system. For 
example, some claim that uncinate processes are critical for operating the 
abdominal air sacs, while some believe they aren't, and consider that their 
main function is stiffening the rib cage. Paul said that elongated posterior 
ribs are an indicator of air sac breathing, but there doesn't seem to be 
consensus on this either. And so on. Do you know if there are any in-depth, 
comprehensive studies on the respiratory complex of the birds? One, that would 
also make a difference between known fact and wild speculation?
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