油井传热瞬态导热函数的高精度近似解
程文龙, 年永乐
High precision approximate solution of transient heat-conduction time function of wellbore heat transfer
CHENG Wenlong, NIAN Yongle
化工学报 . 2013, (5): 1561 -1565 .  DOI: 10.3969/j.issn.0438-1157.2013.05.008