Previous Article Next Article Table of Contents Nature, Vol.502, No.7472, E2-E3, 2013 DOI10.1038/nature12621 Export Citation Controversy about ultrahard nanotwinned cBN reply Tian YJ, Xu B, Yu DL, Ma YM, Wang YB, Jiang YB, Hu WT, Tang CC, Gao YF, Luo K, Zhao ZS, Wang LM, Wen B, He JL, Liu ZY Please enable JavaScript to view the comments powered by Disqus.