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      <marc:subfield code="a">Sheng, C. L., </marc:subfield>
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      <marc:subfield code="a">"Communication networks are characterised by stochastic operating environment. This is due to the fact that occurrence of a demand for service is not known in advance and therefore cannot be described in a deterministic framework. Moreover the time taken to service a demand is also random and can only be described statistically"--Introduction, page 1.</marc:subfield>
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