Zone diagrams in Euclidean spaces and in other normed spaces
Efficient Algorithms for the Hitchcock Transportation Problem
Covering points in the plane by k-tours
SIAM Journal on Computing
Proceedings of the twenty-ninth annual ACM symposium on Theory of computing - STOC ’97
Proceedings of the 2010 annual symposium on Computational geometry - SoCG ’10
Naoki Katoh
Hisao Tamaki
Jun Nakano
Ji?i Matoušek
Tetsuo Asano
Akitoshi Kawamura
The geometric maximum traveling salesman problem
Polynomial time approximation schemes for Euclidean traveling salesman and other geometric problems