The following publications are possibly variants of this publication:
- A polynomially solvable special case of the unbounded knapsack problemMoshe Zukerman, Long Jia, Timothy D. Neame, Gerhard J. Woeginger. orl, 29(1):13-16, 2001. [doi]
- Well-Solvable Special Cases of the Traveling Salesman Problem: A SurveyRainer E. Burkard, Vladimir G. Deineko, René van Dal, Jack A. A. van der Veen, Gerhard J. Woeginger. siamrev, 40(3):496-546, 1998. [doi]