TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.3.22 TI - Rocks as Fractals JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 3 IS - SP - 22 EP - PY - 1999/04/15/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.3.22 A1 - Mackenzie, Dana ER -