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11
Chartrand, Gary., 411-C486m | Addison Wesley | 2003 411-C486m,
12
Tietenberg, Thomas H, 321.3-T564e | Addison Wesley | 2003 321.3-T564e,
13
Hewitt, Paul G., 420.1-H611c | Addison Wesley | 2003 420.1-H611c,