"Electric Field Reading Head, Electric Field Writing/Reading Head and Fabrication methods thereof and Information Storage"
J. Jung, H. Ko, H. Park, Y. Kim, S. Hong,
WO 2,007,129,871 (2007)(issued),
US 8,432,001 B2 (2013)(issued),
EP 2016584 (2009)(filed),
CN101490750 B (2011)(issued)