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3.2 The [chapterbib] option

This option enables per-chapter bibliographies. Each chapter must have its own bibliography. If you are using natbib for bibliographies, per-chapter bibliographies can be implemented using the chapterbib package. Please read its documentation carefully, as it requires each chapter to be a separate file. A newer alternative which I highly recommend is to use biblatex for your bibliography, which makes per-chapter bibliographies very simple. If you have per-chapter bibliographies you cannot have a global bibliography.