1. C. Berge, The Theory of Graphs and Its Applications [Russian translation], IL, Moscow (1962), pp. 88?89.
2. A. Coffman, Introduction to Applied Combinatorics [Russian translation], Nauka, Moscow (1975), pp. 370?371.
3. G. N. Adel'son-Vel'skii, E. A. Dinits, and A. V. Karzanov, Flow Algorithms [in Russian], Nauka, Moscow (1975), pp. 25?41.
4. L. E. Kornilova, ?The minimal flow and maximal rate of change in a network,? in: Mathematical Methods in Economics Research and Planning [in Russian], No. 1, Inst. Kibern. Akad. Nauk UkrSSR (1967), pp. 35?45.
5. L. R. Ford and D. R. Fulkerson, Flows in Networks [Russian translation], Mir, Moscow (1962), pp. 33?35.