TY - JOUR PB - American Physical Society ID - 10.1103/Physics.4.10 TI - A landmark proof JF - Physics JA - Physics J1 - PHYSICS VL - 4 IS - SP - 10 EP - PY - 2011/02/07/ UR - http://link.aps.org/doi/10.1103/Physics.4.10 A1 - Wilczek, Frank ER -