00270nam a2200121Ia 4500008004100000041001200041082001500053100001800068245001700086260001700103300001100120650001700131231217s9999    xx            000 0 und d  aEnglish  a511.5  HAR  aHarary, Frank 0aGraph theory  c1969bNarosa  axi+286  aGraph theory