TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.12.5 TI - How the Proton Got its Spin JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 12 IS - SP - 5 EP - PY - 2003/08/08/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.12.5 A1 - Lindley, David ER -