Tungsten tetraboride, an inexpensive superhard material.
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Proc Natl Acad Sci U S A. 2011 Jul 5;108(27):10958-62. doi: 10.1073/pnas.1102636108. Epub 2011 Jun 20.
Proc Natl Acad Sci U S A. 2011.
PMID: 21690363
Free PMC article.