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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Bonnington, C. Paul; Little, Charles H. C. (1995), The foundations of topological graph theory, New York: Springer-Verlag, p. 31, doi:10.1007/978-1-4612-2540-9, ISBN 0-387-94557-1, MR 1367285 <a href="0-387-94557-1" target="_blank">0-387-94557-1</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Lins, Sóstenes (1982), "Graph-encoded maps", Journal of Combinatorial Theory, Series B, 32 (2): 171–181, doi:10.1016/0095-8956(82)90033-8, MR 0657686 <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Bonnington, C. Paul; Little, Charles H. C. (1995), The foundations of topological graph theory, New York: Springer-Verlag, p. 31, doi:10.1007/978-1-4612-2540-9, ISBN 0-387-94557-1, MR 1367285 <a href="0-387-94557-1" target="_blank">0-387-94557-1</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Bonnington, C. Paul; Little, Charles H. C. (1995), The foundations of topological graph theory, New York: Springer-Verlag, p. 31, doi:10.1007/978-1-4612-2540-9, ISBN 0-387-94557-1, MR 1367285 <a href="0-387-94557-1" target="_blank">0-387-94557-1</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Bonnington, C. Paul; Little, Charles H. C. (1995), The foundations of topological graph theory, New York: Springer-Verlag, p. 31, doi:10.1007/978-1-4612-2540-9, ISBN 0-387-94557-1, MR 1367285 <a href="0-387-94557-1" target="_blank">0-387-94557-1</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Bonnington & Little (1995), pp. 111–112. - Bonnington, C. Paul; Little, Charles H. C. (1995), The foundations of topological graph theory, New York: Springer-Verlag, p. 31, doi:10.1007/978-1-4612-2540-9, ISBN 0-387-94557-1, MR 1367285 <a href="https://books.google.com/books?id=GtjiBwAAQBAJ&pg=PA31" target="_blank">https://books.google.com/books?id=GtjiBwAAQBAJ&pg=PA31</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> </ol>