Integrated Operational Transportation Planning in Theory and Practice. - Herbert Kopfer; Marta Anna Krajewska (OR, 2006)

Collaborating freight forwarding enterprises. - Marta Anna Krajewska; Herbert Kopfer (OR Spectr., 2006)

Praktische Aspekte der kollaborativen Auftragsdisposition. - Herbert Kopfer; Marta Anna Krajewska (GI Jahrestagung (1), 2007)

Horizontal cooperation among freight carriers: request allocation and profit sharing. - Marta Anna Krajewska; Herbert Kopfer; Gilbert Laporte; Stefan Ropke; Georges Zaccour (J. Oper. Res. Soc., 2008)

Transportation planning in freight forwarding companies: Tabu search algorithm for the integrated operational transportation planning problem. - Marta Anna Krajewska; Herbert Kopfer (Eur. J. Oper. Res., 2009)