Haaparanta, Pertti Dual exchange markets and intervention / Pertti Haaparanta - Helsinki, Finland : World Institute for Development Economics Research (WIDER) , 1986 - 22p. ; 21 cm. - WIDER working papers, WP 6 0782-8233 ; . "August 1986." Includes bibliographical references. ISSN: 07828233 Subjects--Topical Terms: Foreign exchange--Mathematical models Gov. Doc. Class. No.: UN U WIDER WP-6