TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.22.21 TI - One-Way Waves JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 22 IS - SP - 21 EP - PY - 2008/12/22/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.22.21 A1 - Schirber, Michael ER -