00322nam a2200109Ia 4500082002000000100003600020245006800056260004100124300001300165500000500178700002900183  a338.54bT587.DB  aTinbergen, Jan and Polak, J. J.  aDynamics of business cycles; a study in economic fluctuationsb  aLondonbRoutledge & Kegan Paulc1950  ax, 366p.  a  aPolak, J. J. ; jt. auth.