@Article{RighSala04,
author = {G. Righini and Matteo Salani },
title = {Dynamic programming algorithms for the elementary shortest path problem with resource constraints},
journal = {Electronic Notes in Discrete Mathematics},
volume = {17},
pages = {247 - 249},
doi = {10.1016/j.endm.2004.03.047},
year = {2004}
}