@TechReport{IoannidouMertziosNikolopoulos-AIB0911, author = "Kyriaki Ioannidou and George B. Mertzios and Stavros D. Nikolopoulos", title = "The Longest Path Problem is Polynomial on Interval Graphs", institution = "RWTH Aachen", year = "2009", number = "AIB-2009-11", month = "April", url = "http://aib.informatik.rwth-aachen.de/2009/2009-11.pdf" }