TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.4.31 TI - Hard as a Diamond? JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 4 IS - SP - 31 EP - PY - 1999/12/16/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.4.31 A1 - Anonymous, ER -