Challen, D. W. Macroeconometric systems : construction, validation and applications / D.W. Challen and A.J. Hagger. - London : Macmillan, 1983. - xiii, 235 p. ; 25 cm. Includes bibliographies and index. ISBN: 0333310845 0333348508 Subjects--Topical Terms: Econometrics.Economics--Mathematical models. Dewey Class. No.: 339 / CHM 1983