Charles H. Kappauf, Gary J. Koehler. The mixed postman problem. Discrete Applied Mathematics, 1(1-2):89-103, 1979. [doi]
@article{KappaufK79,
title = {The mixed postman problem},
author = {Charles H. Kappauf and Gary J. Koehler},
year = {1979},
doi = {10.1016/0166-218X(79)90016-7},
url = {http://dx.doi.org/10.1016/0166-218X(79)90016-7},
researchr = {https://researchr.org/publication/KappaufK79},
cites = {0},
citedby = {0},
journal = {Discrete Applied Mathematics},
volume = {1},
number = {1-2},
pages = {89-103},
}