It is tough to be a plumber

Daniel Král, Vladan Majerech, Jiří Sgall, Tomáš Tichý, and Gerhard J. Woeginger
Tech. report 2002-061, Charles Univ., Inst. Teoretické Informatiky (ITI), 2002
KAM-DIMATIA Series, Charles Univ., Dept. of Applied Mathematics, 2002
http://kam.mff.cuni.cz/~kamserie/serie/clanky/2002/s563.ps
http://iti.mff.cuni.cz/series/files/iti061ps.zip

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