The p/q-active uncapacitated facility location problem: Investigation of the solution space and an LP-fitting heuristic. - Anders Dohn; Søren Gram Christensen; David Magid Rousøe (Eur. J. Oper. Res., 2007)

Container loading with multi-drop constraints. - Søren Gram Christensen; David Magid Rousøe (Int. Trans. Oper. Res., 2009)