1. Stability of the travelling-salesman problem;Leont'yev;Zh. vych. Mat. i mat. Fiz.,1975
2. Stability in linear discrete problems;Leont'yev;Probl. Kibernetiki,1979
3. Stability in discrete extremal problems;Gordeyev,1980
4. Evaluation of the radius of stability in special cases;Gordeyev,1981
5. Combinatorial optimization. Networks and matroids;Lowler,1976