TY - JOUR PB - American Physical Society ID - 10.1103/Physics.4.66 TI - All that is gold does not glitter JF - Physics JA - Physics J1 - PHYSICS VL - 4 IS - SP - 66 EP - PY - 2011/08/22/ UR - http://link.aps.org/doi/10.1103/Physics.4.66 A1 - Daniilidis, Nikos AU - Häffner, Hartmut ER -