Seidel, D.J., Angell, J.K., Christy, J.R., Free, M., Klein, S.A., Lanzante, J.R., Mears, C., Parker, D.E., Schabel, M., Spencer, R., Thorne, Peter and Wentz, F.J. (2004) Uncertainty in Signals of Large-Scale Climate Variations in Radiosonde and Satellite Upper-Air Temperature Datasets. Journal of Climate, 17 (11). pp. 2225-2240. ISSN 0894-8755