8Berger H H. Models for contacts to planar devices[J].Solid-State Electronics, 1972,15:145.
9Reeves G K. Specific contacts resistance using a circular transmission line model [J ]. Solid State Electronics,1980,23: 487.
10Marlow G S, Das M B. The effects of contact size and non-zero metal resistance on the determination of specific contact resistance[J]. Solid-St Electron, 1982,25(2):91.