@Article{cl-oslos-05
,   author =     "Colin de Verdi{\`e}re, {\'E}ric and Lazarus, Francis"
,   title =      "Optimal System of Loops on an Orientable Surface"
,   journal =    "Discrete \& Computational Geometry"
,   volume =     33
,   number =     3
,   pages =      "507--534"
,   month =      mar
,   year =       "2005"
,   note =       "A conference version appeared in \emph{Proc.\ IEEE Symp.\ on Foundations of Computer Science (FOCS)}, 2002. A preliminary version appeared in \emph{Abstr.\ Europ.\ Workshop on Computational Geometry (EuroCG)}, 2002"
}