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Ahn, S. H. and Ok, J. G. and Kwak, M. K. and Lee, K. T. and Lee, J. Y. and Guo, L. J.. (2013) Template-Free Vibrational Indentation Patterning (VIP) of Micro/Nanometer-Scale Grating Structures with Real-Time Pitch and Angle Tunability. Advanced Functional Materials, 23 (37). pp. 4739-4744.