Two notes on a Markoff envelope process (Corresp.). - Carl W. Helstrom; C. T. Isley (IRE Trans. Inf. Theory, 1959)

Comments on 'A Markoff Envelope Process'. - C. T. Isley (IRE Trans. Inf. Theory, 1959)

Probability distribution for the derivative of the envelope of signal and Gaussian noise (Corresp.). - C. T. Isley (IRE Trans. Inf. Theory, 1960)