Porter, Brian. Modal control: theory and applications [by] Brian Porter and Roger Crossley. - London, New York, London, New York, Taylor & Francis; Barnes & Noble, Taylor & Francis; Barnes & Noble, 1972. Includes bibliographical references. ISBN: L.7.00 LCCN: 73158795 Nat. Bib. No.: B72-31798 Subjects--Topical Terms: Control theory.Automatic control. LC Class. No.: QA402.3 / .P64 Dewey Class. No.: 629.8/32