Add graph references

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

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+FUNDAMENTAL CYCLE BASIS
+
+Null graph
+
+Singleton graph
+
+Single vertex with loop
+( 0 )
+
+Tree
+
+2-cycle
+( 0 1 )
+
+Disconnected
+( 1 0 2 )
+( 4 5 )
+( 3 5 )
+( 7 6 10 )
+( 8 10 9 )
+( 11 )
+( 13 )
+
+MINIMUM WEIGHT CYCLE BASIS
+
+Null graph
+
+Singleton graph
+
+Single vertex with loop
+( 0 )
+
+Tree
+
+2-cycle
+( 0 1 )
+
+Disconnected
+( 11 )
+( 13 )
+( 3 5 )
+( 4 5 )
+( 0 1 2 )
+( 6 7 10 )
+( 8 9 10 )
+
+Periodic (5,6)-grid
+( 0 1 10 3 )
+( 0 51 50 53 )
+( 1 8 9 18 )
+( 2 3 12 5 )
+( 2 53 52 55 )
+( 4 5 14 7 )
+( 4 55 54 57 )
+( 6 7 16 9 )
+( 6 57 56 59 )
+( 8 59 58 51 )
+( 10 11 20 13 )
+( 11 18 19 28 )
+( 12 13 22 15 )
+( 14 15 24 17 )
+( 16 17 26 19 )
+( 20 21 30 23 )
+( 21 28 29 38 )
+( 22 23 32 25 )
+( 24 25 34 27 )
+( 26 27 36 29 )
+( 30 31 40 33 )
+( 31 38 39 48 )
+( 32 33 42 35 )
+( 34 35 44 37 )
+( 36 37 46 39 )
+( 40 41 50 43 )
+( 41 48 49 58 )
+( 42 43 52 45 )
+( 44 45 54 47 )
+( 0 8 6 4 2 )
+( 1 51 41 31 21 11 )