You can find something from this paper.

Huang, J., Higuchi, K., & Shabbar, A. (1998). The relationship between the North Atlantic Oscillation and El Niño‐Southern Oscillation. Geophysical Research Letters, 25(14), 2707-2710.

Thank you very much Xiting Liu. This is helpful.

Alain

Hi, 

Also, these papers and the references therein will be good ones to have a read:

Scaife, A. A., et al. (2014), Skillful long-range prediction of European and North American winters, Geophys. Res. Lett., 41, 2514–2519, doi:10.1002/2014GL059637.

Domeisen, D., A. Butler, K. Fröhlich, M. Bittner, W. Müller, and J. Baehr, 2015: Seasonal Predictability over Europe Arising from El Niño and Stratospheric Variability in the MPI-ESM Seasonal Prediction System. J. Climate, 28, 256–271, doi: 10.1175/JCLI-D-14-00207.1.

As ENSO-NAO interaction is a popular topic, you'll find a number of interesting papers - good luck! 

From a statistical point of view: 

Garcia et al. (2000) Letter to the editor Are the North Atlantic Oscillation and the Southern Oscillation related in any time-scale? Annales Geophysicae 

http://link.springer.com/article/10.1007/s00585-000-0247-z