TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.13.3 TI - Momentum From Nothing JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 13 IS - SP - 3 EP - PY - 2004/01/23/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.13.3 A1 - Cho, Adrian ER -