二维正交各向异性位势问题的高阶单元快速多极边界元法1)
李聪, 胡斌, 胡宗军, 牛忠荣

ANALYSIS OF 2-D ORTHOTROPIC POTENTIAL PROBLEMS USING FAST MULTIPOLE BOUNDARY ELEMENT METHOD WITH HIGHER ORDER ELEMENTS1)
Li Cong, Hu Bin, Hu Zongjun, Niu Zhongrong
图6 "近场积分"和"远场积分"
Fig.6 "The near-field integrals" and "the far-field integrals"