1. M. Balinski and R.E. Gomory: A Primal Method for the Assignment and Transportation Problem, Manage. Sci., 10 (1966), 578–593.
2. M. Ball, L. Bodin and R. Dial: A Matching Based Heuristic for Scheduling Mass Transit Crews and Vehicles, to appear in Transportation Science.
3. M. Ball and U. Derigs: An Analysis of Alternate Strategies for Implementing Matching Algorithms, Report 82226 OR, Institut für Ukonometrie und Operations Research, Universität Bonn, (1982).
4. R.S. Barr, F. Glover and D. Klingman: The Alternating Basis Algorithm for Assignment Problems, MP 13 (1977), 1–13.
5. C. Berge: Two Theorems in Graph Theory, Proc. Natl. Acad. Sci. USA, 43 (1957), 842–844.