In a recent letter by Phan and Kim,A a new definition of the multiple-root sensitivity is given. However, it may be pointed out that exactly the same definition was given some time agoB and is also included in some text books,Cand is used for the same reasons as advanced by the authors. © 1973, The Institution of Electrical Engineers. All rights reserved.

Madhukar Dave

Electrical Engineering

(SoE) School of Engineering

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