H. M. James; N. B. Nichols; R. S. Phillips, eds. (1947). Theory of Servomechanisms(PDF). McGraw-Hill. Archived from the original(PDF) on 2010-07-05. Retrieved 2010-06-26.
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H. M. James; N. B. Nichols; R. S. Phillips, eds. (1947). Theory of Servomechanisms(PDF). McGraw-Hill. Archived from the original(PDF) on 2010-07-05. Retrieved 2010-06-26.