Robert Brijder Hendrik Jan Hoogeboom Grzegorz Rozenberg Reduction Graphs from Overlap Graphs for Gene Assembly in Ciliates. 271-291 2009 20 Int. J. Found. Comput. Sci. 2 http://dx.doi.org/10.1142/S0129054109006553 db/journals/ijfcs/ijfcs20.html#BrijderHR09