1. On the problem of minimising a linear form on the set of all complete cycles of the symmetric group Sn;Aizenshtat;Kybernetica,1968
2. Internal Report;Burkard,1985
3. The travelling salesman problem with asymmetric matrices;Demidenko;Isv. Akad. Nauk BSSR, ser fiz.-mat. nauk,1979
4. Testing the necklace condition for shortest tours and optimal factors in the plane;Edelsbrunner,1987
5. Minimizing wallpaper waste, Part I: a class of travelling salesman problems;Garfinkel;Oper. Res.,1977