Problems in skew-symmetric and bidirected graphs:

• M.A. Babenko and A.V. Karzanov, Minimum mean cycle problem in bidirected and skew-symmetric graphs, Discrete Optimization, 6, No.1, 2009, 92-97. (Draft in ArXiv:math.CO/0608443.)  [PDF]
• M.A. Babenko and A.V. Karzanov, Free multiflows in bidirected and skew-symmetric graphs, Discrete Applied Math., 155, 2007, 1715-1730. [PDF]
• A.V. Goldberg and A.V. Karzanov, Maximum skew-symmetric flows and matchings, Mathematical Programming, 100, No.3, 2004, 537-568.  [PDF] (See also  [journ])
• A.V. Goldberg and A.V. Karzanov, Path problems in skew-symmetric graphs, Combinatorica, 16, No.3, 1996, 353-382. [PDF] (See also [journ])

 Preprints, technical reports and extended abstracts:

• A.V. Goldberg and A.V. Karzanov, Maximum skew-symmetric flows and their applications to b-matchings, Preprint 99-043, SFB343, Bielefeld Universität, Bielefeld, 1999, 25pp. [PDF]
• A.V. Goldberg and A.V. Karzanov, Maximum skew-symmetric flows, In: Proc. of 3rd Annual European Symposium on Algorithms (Corfu, Greece, 1995), Lecture Notes in Computer Sci., 979, pp.155-170. [journ]
• A.V. Goldberg and A.V. Karzanov, Path problems in skew-symmetric graphs, Technical Report STAN-CS-93-1489, Computer Sci. Dept., Stanford Univ., Palo Alto, 1993, 31pp. [PDF]