Adrian Dumitrescu. The Traveling Salesman Problem for Lines and Rays in the Plane. Discrete Math., Alg. and Appl., 4(4), 2012. [doi]
@article{Dumitrescu12-0, title = {The Traveling Salesman Problem for Lines and Rays in the Plane}, author = {Adrian Dumitrescu}, year = {2012}, doi = {10.1142/S1793830912500449}, url = {http://dx.doi.org/10.1142/S1793830912500449}, researchr = {https://researchr.org/publication/Dumitrescu12-0}, cites = {0}, citedby = {0}, journal = {Discrete Math., Alg. and Appl.}, volume = {4}, number = {4}, }