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Koeller, P., Fuentes-Yaco, C., Platt, T., Sathyendranath, S., Richards, A., Ouellet, P., Orr, D., Skúladóttir, U., Wieland, K.. Savard, L., Aschan, M. (2009)
Kokhanovsky, A. A. and L. G. Sokoletsky (2006)