Determinations of state-variable equations for admittance descriptions suitable for the computer
Jason Miller, R.W. Newcomb · Proceedings of the IEEE · 1968
A simplified procedure is described for finding the state equations of an n-port network from its admittance description. The restrictions on this procedure are that the network be linear, but perhaps time-varying, and made up of a finite number of lumped elements in a configuration such that an admittance description exists for the nondynamical portions of the network.