$k$-best solutions under distance constraints in valuated $\Delta$-matroids
Ingo Althöfer
and Walter Wenzel
Advances in Applied Mathematics 22(4):381–412, May 1999
Tech. report Math/Inf/98/14, Friedrich-Schiller-Univ. Jena, Fakultät für Mathematik und Informatik, 27 May 1998
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