Harold W. Thimbleby. The directed Chinese Postman Problem. Software: Practice and Experience, 33(11):1081-1096, 2003. [doi]
@article{Thimbleby03a, title = {The directed Chinese Postman Problem}, author = {Harold W. Thimbleby}, year = {2003}, doi = {10.1002/spe.540}, url = {http://dx.doi.org/10.1002/spe.540}, researchr = {https://researchr.org/publication/Thimbleby03a}, cites = {0}, citedby = {0}, journal = {Software: Practice and Experience}, volume = {33}, number = {11}, pages = {1081-1096}, }