DGOR Papers of the Annual Meeting 1973 / Vorträge der Jahrestagung 1973 Operations Research Proceedings, nr. 1973 Editat de P. Gessner et al. 1974 Paperback Preț: 385.43 lei 38-44 zile
Vorträge der Jahrestagung 1972 DGOR / Papers of the Annual Meeting 1972 Operations Research Proceedings, nr. 1972 Editat de H. Jacob et al. 1973 Paperback Preț: 386.66 lei 38-44 zile