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<cite style="font-style:normal">Arkin, E.M.; S.P. Fekete, J.S.B. Mitchell (2000). "<a rel="nofollow" class="external text" href="http://www.ict.griffith.edu.au/~vlad/teaching/AlgEng/READINGS/ApproxCovering/lawn.pdf">Approximation algorithms for lawn mowing and milling</a>". <i>Computational Geometry</i> <b>17</b> (1-2): 25–50.</cite>