The selective vehicle routing problem in a collaborative environment. - Christof Defryn; Kenneth Sörensen; Trijntje Cornelissens (Eur. J. Oper. Res., 2016)

A fast two-level variable neighborhood search for the clustered vehicle routing problem. - Christof Defryn; Kenneth Sörensen (Comput. Oper. Res., 2017)

Multi-objective optimisation models for the travelling salesman problem with horizontal cooperation. - Christof Defryn; Kenneth Sörensen (Eur. J. Oper. Res., 2018)

Inland waterway efficiency through skipper collaboration and joint speed optimization. - Christof Defryn; Julian Arthur Pawel Golak; Alexander Grigoriev; Veerle Timmermans (Eur. J. Oper. Res., 2021)

Data-driven optimization and statistical modeling to improve meter reading for utility companies. - Debdatta Sinha Roy; Christof Defryn; Bruce L. Golden; Edward A. Wasil (Comput. Oper. Res., 2022)

Balancing partner preferences for logistics costs and carbon footprint in a horizontal cooperation. - Thomas Hacardiaux; Christof Defryn; Jean-Sébastien Tancrez; Lotte Verdonck (OR Spectr., 2022)

Order Picking: Exploring the Properties of the Greedy Seed-Based Batching Algorithm. - Son Tran Thai; Rui Jorge Almeida; Christof Defryn (CEC, 2023)

Synchronous Parallel Heuristics for Solving the Joint Order Batching and Picker Routing Problem. - Son Tran Thai; Rui Jorge Almeida; Christof Defryn; Inneke Van Nieuwenhuyse (CEC, 2024)

The impact of product characteristics and innovativeness on the benefits of collaboration. - Thomas Hacardiaux; Jean-Sébastien Tancrez; Christof Defryn; Lotte Verdonck (Int. Trans. Oper. Res., 2024)