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 Udelhofen, P. M. and  D. L. Hartmann, 1995 
 Influence of tropical cloud systems on the relative humidity 
 in the upper troposphere 
 J.Geophys.Res.,vol.100,no.D4,7423-7440  
  
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 Thompson, D. W. J. and J. M. Wallace 1998:  
 Structure of the Arctic and Antarctic Oscillations.  
 J.Climate (submitted) 
  
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