1. Greedy algorithm and symmetric matroids;Bouchet;Math. Programming,1987
2. Representability of Δ-matroids;Bouchet,1987
3. A. Bouchet and A. Duchamp, Representability of Δ-matroids over GF(2), submitted.
4. Eulerian lines in finite 4-valent graphs and their transformations;Kotzig,1986
5. Eulerian circuits of 4-valent graphs imbedded in surfaces;Las Vergnas,1981