@Article{RighiSala08,
author = {G. Righini and Matteo Salani },
title = {Decremental state space relaxation strategies and initialization heuristics for solving the orienteering problem with time windows with dynamic programming},
journal = {Computers & Operations Research},
volume = {36},
number = {4},
pages = {1191-1203},
doi = {10.1016/j.cor.2008.01.003},
year = {2009}
}