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[plante1987product]
Robert D. Plante, Timothy J. Lowe, and R. Chandrasekaran
The product matrix traveling salesman problem: an application and solution heuristic
Operations Research 35(5), 772–783, 1987

[gilmore1985well]
Paul C. Gilmore, Eugene L. Lawler, and David Shmoys
Well-solved special cases of the traveling salesman problem
The Traveling Salesman Problem, 1985

[sarvanov1980complexity]
VI Sarvanov
On the complexity of minimizing a linear form on a set of cyclic permutations
Dokl. Akad. Nauk SSSR, 533–535, 1980