@article {5523,
	title = {Model-hierarchical column generation and heuristic for the routing and wavelength assignment problem},
	journal = {4OR},
	volume = {14},
	number = {2},
	year = {2016},
	pages = { 201{\textendash}220},
	abstract = {The routing and wavelength assignment (RWA) problem typically occurs in wavelength division multiplexing optical networks. Given a number of available wavelengths, we consider here the problem of maximising the number of accepted connections with respect to the clash and continuity constraints. We first propose a new strategy which combines two existing models. This leads to an improved column generation scheme. We also present two heuristics to compute feasible solutions: a hybrid heuristic and the integer solution at the root node of the column generation. Our approaches are compared with the best existing results on a set of classic RWA instances.},
	url = {https://link.springer.com/article/10.1007/s10288-016-0309-z},
	author = {Christophe Duhamel and Philippe Mahey and Alexandre X. Martins and Rodney R. Saldanha and Rodney R. Saldanha}
}
