Coarse-grained model for spring friction study of micron-scale iron by smoothed particle hydrodynamicsLe Van Sang, Akihiko Yano, Shuji Fujii, Natsuko Sugimura and Hitoshi WashizuEPL, 122 2 (2018) 26004DOI: https://doi.org/10.1209/0295-5075/122/26004