Add graph references

references/igraph-1.0.1/tests/unit/pajek_signed.out

@@ -0,0 +1,56 @@
+Vertex 0: name="S65"
+Vertex 1: name="S29"
+Vertex 2: name="S04"
+Vertex 3: name="S75"
+Vertex 4: name="S24"
+Vertex 5: name="S81"
+Vertex 6: name="S51"
+Vertex 7: name="S78"
+Vertex 8: name="S86"
+Vertex 9: name="S39"
+Edge 0 (0-5): weight=1
+Edge 1 (0-9): weight=-1
+Edge 2 (1-2): weight=1
+Edge 3 (1-3): weight=1
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+Edge 11 (3-0): weight=-1
+Edge 12 (3-1): weight=1
+Edge 13 (3-4): weight=1
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+Edge 39 (9-3): weight=1
+Edge 40 (9-4): weight=1
+Edge 41 (9-5): weight=1
+Edge 42 (9-6): weight=1
+Edge 43 (9-7): weight=1
+Edge 44 (9-8): weight=1
+