TY - JOUR AU - Hai-Shou Yang AU - Q. Hong AU - Y. Ding BT - Solar Physics DA - Jan-01-1988 DO - 10.1007/BF00148572 PY - 1988 SP - 57 EP - 67 T2 - Solar Physics TI - A constant-alpha force-free-field analysis of the active region AR 4711 of February, 1986 UR - http://link.springer.com/10.1007/BF00148572 VL - 117 SN - 0038-0938 ER -