Finding complementary cycles in locally semicomplete digraphs. - Jørgen Bang-Jensen; Morten Hegner Nielsen (Discret. Appl. Math., 2005)

Longest path partitions in generalizations of tournaments. - Jørgen Bang-Jensen; Morten Hegner Nielsen; Anders Yeo (Discret. Math., 2006)

A Traceability Conjecture for Oriented Graphs. - Marietjie Frick; Susan A. van Aardt; Jean E. Dunbar; Morten Hegner Nielsen; Ortrud R. Oellermann (Electron. J. Comb., 2008)

Minimum cycle factors in quasi-transitive digraphs. - Jørgen Bang-Jensen; Morten Hegner Nielsen (Discret. Optim., 2008)

On a cycle partition problem. - Morten Hegner Nielsen (Discret. Math., 2008)

Local Steiner convexity. - Michael A. Henning; Morten Hegner Nielsen; Ortrud R. Oellermann (Eur. J. Comb., 2009)

Steiner Trees and Convex Geometries. - Morten Hegner Nielsen; Ortrud R. Oellermann (SIAM J. Discret. Math., 2009)

Traceability of k-traceable oriented graphs. - Susan A. van Aardt; Jean E. Dunbar; Marietjie Frick; Peter Katrenic; Morten Hegner Nielsen; Ortrud R. Oellermann (Discret. Math., 2010)

Cycles in k-traceable oriented graphs. - Susan A. van Aardt; Jean E. Dunbar; Marietjie Frick; Morten Hegner Nielsen (Discret. Math., 2011)

The order of hypotraceable oriented graphs. - Susan A. van Aardt; Marietjie Frick; Peter Katrenic; Morten Hegner Nielsen (Discret. Math., 2011)

Helly theorems for 3-Steiner and 3-monophonic convexity in graphs. - Morten Hegner Nielsen; Ortrud R. Oellermann (Discret. Math., 2011)

Separation properties of 3-Steiner and 3-monophonic convexity in graphs. - Morten Hegner Nielsen; Ortrud R. Oellermann (Discret. Math., 2012)

Factors with Multiple Degree Constraints in Graphs. - Richard C. Brewster; Sean McGuinness; Morten Hegner Nielsen (SIAM J. Discret. Math., 2013)