Global properties of continuous piecewise linear vector fields. Part I: Simplest case in ℝ2. - Robert Lum; Leon O. Chua (Int. J. Circuit Theory Appl., 1991)

Global properties of continuous piecewise linear vector fields. Part II: Simplest symmetric case in ℝ2. - Robert Lum; Leon O. Chua (Int. J. Circuit Theory Appl., 1992)

How to represent continuous piecewise linear functions in closed form. - Robert Lum; Leon O. Chua (Int. J. Circuit Theory Appl., 2006)

A fast algorithm for representing continuous piecewise linear functions in closed form. - Robert Lum; Leon O. Chua (Int. J. Circuit Theory Appl., 2007)