title: Dynamic extension-contraction motion in supramolecular springs.
authors: Center for Supramolecular Nano-Assembly and Department of Chemistry, Yonsei University, Seoul 120-749, Korea.
authors: Ho-Joong
authors: HJ
authors: Kim
authors: Eunji
authors: E
authors: Lee
authors: Hye-seo
authors: HS
authors: Park
authors: Myongsoo
authors: M
authors: Lee