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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Fedotoff, Roy C.; Bellows, Peter H.; Frutchey, Robert W.; Thomson, James (1991). "Trenchless Techniques Improve Pipelines". Water Environment & Technology. 3 (4): 48–52. ISSN 1044-9493. <a href="https://www.jstor.org/stable/24661358" target="_blank">https://www.jstor.org/stable/24661358</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>