S. L. Hahn

Complex variable frequency electric circuit theory

S. L. Hahn, 1964 .

The Instantaneous Complex Frequency of the Sum of Two Harmonic Signals

S. L. Hahn, 2000 .

Multidimensional complex signals with single-orthant spectra

S. Hahn, S. L. Hahn, 1992, Proc. IEEE.