Paper by Kobayakawa et al. is accepted for publication in Physical Review E
"Local dilation and compaction of granular materials induced by plate drag",
Murino Kobayakawa, Shinichiro Miyai, Takuya Tsuji and Toshitsugu Tanaka
Phys. Rev. E 98, 052907 (2018)
https://journals.aps.org/pre/abstract/10.1103/PhysRevE.98.052907