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Dragomiretskiy and D.\nZosso in IEEE Transactions on Signal Processing, vol. 62, no.\n3, pp. 531-544, Feb.1, 2014, ;\n(ii) 'Two-Dimensional Variational Mode Decomposition' by\nDragomiretskiy, K., Zosso, D. (2015), In: Tai, XC., Bae, E.,\nChan, T.F., Lysaker, M. (eds) Energy Minimization Methods in\nComputer Vision and Pattern Recognition. EMMCVPR 2015. Lecture\nNotes in Computer Science, vol 8932. 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