Before revision: Furthermore, recent workC.-M. Tsai, and K. C. Gupta, "A generalized model for coupled lines and its applications to two-layer planar circuits", IEEE Transactions on Microwave Theory & Techniques, Vol.
After revision: Furthermore, previous workC.-M. Tsai, and K. C. Gupta, "A generalized model for coupled lines and its applications to two-layer planar circuits", IEEE Transactions on Microwave Theory & Techniques, Vol.