The dynamics of business cycles : a study in economic fluctuations / Jan Tinbergen and J. J. Polak Tinbergen, Jan Polak, J. J. aut. Business cycles. HB3711 .T483 1950a 338.54 TID Includes bibliographical references and index. Routledge & K. Paul, London : 1950 1950 1950 Text x, 366 p. : eng