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doi.org
Ouaknine, Joël; Worrell, James (2012), "Decision problems for linear recurrence sequences", Reachability Problems: 6th International Workshop, RP 2012, Bordeaux, France, September 17–19, 2012, Proceedings, Lecture Notes in Computer Science, vol. 7550, Heidelberg: Springer-Verlag, pp. 21–28, doi:10.1007/978-3-642-33512-9_3, ISBN978-3-642-33511-2, MR3040104.
Blondel, Vincent D.; Portier, Natacha (2002), "The presence of a zero in an integer linear recurrent sequence is NP-hard to decide", Linear Algebra and Its Applications, 351/352: 91–98, doi:10.1016/S0024-3795(01)00466-9, MR1917474.