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https://research.utwente.nl/en/publications/shrinkage-control-of-photoresist-for-large-area-fabrication-of-su/ Shrinkage Control of Photoresist for Large-Area Fabrication of Sub-30 nm Periodic Nanocolumns -... https://freidok.uni-freiburg.de/data/173171 FreiDok plus - Electrical performance of gallium nitride nanocolumns electrical performancegallium nitrideplus