Text ( visual ) : unmediated Indirect management in a centrally planned economy : system constructions in foreign trade / Witold Trzeciakowski. -- Amsterdam ; New York : North-Holland Pub. Co. ; New York : Sole distributors for the U.S.A. and Canada, Elsevier North-Holland , 1978. -- x, 279 p. : ill. ; 24 cm. -- (Contributions to economic analysis ; 115). -- Bibliography: p. [261]-269 ; Includes index. -- ISBN 0720431891 ; (BA0348339X) ; https://ci.nii.ac.jp/ncid/BA0348339X Author Heading(s): Trzeciakowski, Witold. -- Classification(s): LCC : HF1411 ; DC : 350/.827. -- Subject Heading(s): LCSH : Communist countries -- Commercial policy -- Mathematical models ; LCSH : Communist countries -- Economic policy -- Mathematical models ; LCSH : Poland -- Commercial policy -- Mathematical models