TY - JOUR AU - Axel Hultman TI - Directed subgraph complexes JO - The electronic journal of combinatorics PY - 2004 VL - 11 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.37236/1828/ DO - 10.37236/1828 ID - 10_37236_1828 ER -