Create graph of citations

[mtillman14]

Inputs:

1. A list of all Work objects to visualize

Steps:

1. Parse the Work objects to generate an edge list of work objects
2. Provide the input list of all Work objects as the nodes list, and the edge list as the edges

Outputs:

1. A NetworkX graph structure, where each node is a Work object.

[mtillman14]

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