Bottlenecks in material cycle of nickelKenichi Nakajima, Ichiro Daigo, Kenichi Okada, Shimpei Koike, Keisuke Nansai, Kazuyo Matsubae, Osamu Takeda and Takahiro MikiMatériaux & Techniques, 104 6-7 (2016) 604DOI: https://doi.org/10.1051/mattech/2017011