TY - JOUR PB - American Physical Society ID - 10.1103/PhysRevFocus.12.25 TI - A Knotty DNA Problem JF - Physical Review Focus JA - Phys. Rev. Focus J1 - FOCUS VL - 12 IS - SP - 25 EP - PY - 2003/12/31/ UR - http://link.aps.org/doi/10.1103/PhysRevFocus.12.25 A1 - Krieger, Kim ER -