Guarding lines and 2-link polygons is apx-hard. - Björn Brodén; Mikael Hammar; Bengt J. Nilsson (CCCG, 2001)

Online and Offline Algorithms for the Time-Dependent TSP with Time Zones. - Björn Brodén; Mikael Hammar; Bengt J. Nilsson (Algorithmica, 2004)

Bandit Algorithms for e-Commerce Recommender Systems: Extended Abstract. - Björn Brodén; Mikael Hammar; Bengt J. Nilsson; Dimitris Paraschakis (RecSys, 2017)

Ensemble Recommendations via Thompson Sampling: an Experimental Study within e-Commerce. - Björn Brodén; Mikael Hammar; Bengt J. Nilsson; Dimitris Paraschakis (IUI, 2018)

A Bandit-Based Ensemble Framework for Exploration/Exploitation of Diverse Recommendation Components: An Experimental Study within E-Commerce. - Björn Brodén; Mikael Hammar; Bengt J. Nilsson; Dimitris Paraschakis (ACM Trans. Interact. Intell. Syst., 2020)