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Discrete Mathematics > 2003 > 270 > 1-3 > 42-59
Monatshefte für Mathematik > 2004 > 141 > 3 > 219-235
Letters in Mathematical Physics > 2001 > 58 > 3 > 223-238
Differential Geometry and its Applications > 2000 > 13 > 3 > 213-233
Differential Geometry and its Applications > 2000 > 13 > 1 > 19-41