The Representation of Atmospheric Blocking and the Associated Low-Frequency Variability in Two Seasonal Prediction Systems Athanasiadis P., Bellucci A.; Hermanson L.; Scaife A.A.; Maclachlan C.; Arribas A.; Materia S., Borrelli A., Gualdi S. 2014, Journal of Climate, Volume 27, Issue 24, Pages 9082 - 9100, doi: 10.1175/JCLI-D-14-00291.1