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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Shapiro, Harold (1971). "2. Best uniform approximation". Topics in Approximation Theory. Lecture Notes in Mathematics. Vol. 187. Springer. pp. 19–22. doi:10.1007/BFb0058978. ISBN 3-540-05376-X. <a href="3-540-05376-X" target="_blank">3-540-05376-X</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>