Visi 2 Paul Keys izlaidumi pie Paperback Book un Har... Book
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![Cover for Paul Keys · Operational Research and Systems: The Systemic Nature of Operational Research - Contemporary Systems Thinking (Paperback Book) [Softcover reprint of the original 1st ed. 1991 edition] (2013)](https://imusic.b-cdn.net/images/item/original/694/9781489906694.jpg?paul-keys-2013-operational-research-and-systems-the-systemic-nature-of-operational-research-contemporary-systems-thinking-paperback-book&class=scaled&v=1395999357)
![Cover for Paul Keys · Operational Research and Systems: The Systemic Nature of Operational Research - Contemporary Systems Thinking (Hardcover Book) [1991 edition] (1991)](https://imusic.b-cdn.net/images/item/original/420/9780306436420.jpg?paul-keys-1991-operational-research-and-systems-the-systemic-nature-of-operational-research-contemporary-systems-thinking-hardcover-book&class=scaled&v=1604016556)