Ahn Bok Yeop, Shoji Daisuke, Hansen Christopher J, Hong Eunji, Dunand David C, Lewis Jennifer A
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, IL 61801, USA.
Adv Mater. 2010 May 25;22(20):2251-4. doi: 10.1002/adma.200904232.