Andreas Brandstädt Konrad Engel Hans-Dietrich O. F. Gronau Roger Labahn Preface: ODSA. 1 2004 138 Discrete Applied Mathematics 1-2 http://dx.doi.org/10.1016/S0166-218X(03)00264-6 db/journals/dam/dam138.html#BrandstadtEGL04