V. Blank et al.: Is C60 fullerite harder than diamond? In: Physics Letters A. Band188, Nr.3, 1994, S.281–286, doi:10.1016/0375-9601(94)90451-0.
Natalia Dubrovinskaia, Leonid Dubrovinsky, Wilson Crichton, Falko Langenhorst, Asta Richter: Aggregated diamond nanorods, the densest and least compressible form of carbon. In: Applied Physics Letters. Band87, Nr.8, 2005, S.083106, doi:10.1063/1.2034101.