@techreport{FrankFuegenschuhHertyetal.2009, author = {Martin Frank and Armin F{\"u}genschuh and Michael Herty and Lars Schewe}, title = {The Coolest Path Problem}, institution = {ZIB}, address = {Takustr. 7, 14195 Berlin}, number = {09-37}, language = {eng}, year = {2009} }