title = {It is tough to be a plumber},
author = {Daniel Kr{\'a}l and Vladan Majerech and Ji{\v{r}}{\'\i} Sgall and Tom{\'a}{\v{s}} Tich{\'y} and Gerhard J. Woeginger},
type = {KAM-DIMATIA Series},
institution = {Charles Univ., Dept. of Applied Mathematics},
number = {2002-563},
year = {2002},
url = {}}

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