Railway Timetabling Using Lagrangian Relaxation. - Ulf Brännlund; Per Olov Lindberg; Andreas Nõu; Jan-Eric Nilsson (Transp. Sci., 1998)

Bregman Proximal Relaxation of Large-Scale 0-1 Problems. - Krzysztof C. Kiwiel; Per Olov Lindberg; Andreas Nõu (Comput. Optim. Appl., 2000)