Esther M. Arkin, Joseph S. B. Mitchell, and Christine D. Piatko,
Minimum-Link Watchman Tours,
Information Processing Letters,
Vol. 86, No. 4, May 2003, pp. 203-207.
E.M. Arkin, K. Kedem, J.S.B. Mitchell, J. Sprinzak,
and M. Werman,
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