Erlang's pioneering work in queuing theory emerged shortly after the start of the twentieth century.The next truly significant work in the field (by Little, et al) came roughly fifty years later.Why the long delay?

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The Answer of Erlang's pioneering work in queuing theory emerged shortly after the start of the twentieth century.The next truly significant work in the field (by Little, et al) came roughly fifty years later.Why the long delay?

Erlang's Pioneering Work in Queuing Theory Emerged Shortly After the Start