Add References

Author: FriedrichRober

doc/LINS.bib

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+@phdthesis{Firth,
+  author      = {Ph.D. thesis},
+  school      = {David Firth},
+  title       = {An Algorithm to Find Normal Subgroups of a Finitely Presented Group, up to a Given Finite Index},
+  year        = {2005},
+  school      = {University of Warwick}
+}