Robert A. Russell. M-Tour Traveling Salesman Problem with Some Side Conditions. Operations Research, 25(3):517-524, 1977. [doi]
@article{Russell77-1,
title = {M-Tour Traveling Salesman Problem with Some Side Conditions},
author = {Robert A. Russell},
year = {1977},
doi = {10.1287/opre.25.3.517},
url = {http://dx.doi.org/10.1287/opre.25.3.517},
researchr = {https://researchr.org/publication/Russell77-1},
cites = {0},
citedby = {0},
journal = {Operations Research},
volume = {25},
number = {3},
pages = {517-524},
}