TY - JOUR AU - Vasily Kravtsov AU - Ronald Ulbricht AU - Joanna Atkin AU - Markus Raschke BT - Nature Nanotechnology DA - 2016-02 DO - 10.1038/nnano.2015.336 PY - 2016 EP - 1\textendash6 T2 - Nature Nanotechnology TI - Plasmonic nanofocused four-wave mixing for femtosecond near-field imaging UR - http://www.nature.com/doifinder/10.1038/nnano.2015.336 SN - 1748-3387 ER -