TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.3.8 TI - Fickle Magnet Switches Poles Twice JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 3 IS - SP - 8 EP - PY - 1999/02/10/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.3.8 A1 - Hellemans, Alexander ER -