1. Guillemin, E.A.: Synthesis of passive networks, (Wiley 1957),chap. 6,
2. Weinberg, L.: Network analysis and synthesis, (McGraw-Hill 1962),chap. 1,
3. Vasseur, J.P.: Properties and application of transistors, (Pergamon 1964),chap. 2,
4. Rogers, F.E.: Topology and matrices in the solution of electrical networks, (Iliffe 1965),chap. 4,