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Page 3807 of Mathematical Reviews Vol. , Issue 95g [page]

<span title="">1995</span> <i title="American Mathematical Society"> <a target="_blank" rel="noopener" href="https://archive.org/details/pub_mathematical-reviews" style="color: black;">Mathematical Reviews </a> </i> &nbsp;
P. (1-CLEM-C; Clemson, SC) Undecidability of Winkler’s r-neighborhood problem for covering digraphs. (English summary) J. Combin. Theory Ser. B 60 (1994), no. 2, 254-267.  ...  Jacobs shows that problem 3 is undecidable for r > 4, and that it remains undecidable (as does problem 1) even if the (graph underlying) G is restricted to being connected, bipartite, and planar. H.  ... 
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Page 151 of Mathematical Reviews Vol. 27, Issue Index [page]

<i title="American Mathematical Society"> <a target="_blank" rel="noopener" href="https://archive.org/details/pub_mathematical-reviews" style="color: black;">Mathematical Reviews </a> </i> &nbsp;
., 95i:05089 Hemachandra, Lane A. see Kratsch, Dieter, 95d:05092 Jacobs, David Pokrass Undecidability of Winkler’s r-neighborhood problem for covering digraphs.  ...  (Hungarian) 95b:05147 Harborth, Heiko Ramsey numbers for sets of five vertex graphs with fixed number of edges. 95a:05077 Hendry, George R. T. Small Ramsey numbers. II.  ... 
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