@article{HHA_2004_6_1_a21,
     author = {Ahmet A. Husainov},
     title = {On the homology of small categories and asynchronous transition systems},
     journal = {Homology, homotopy, and applications},
     pages = {439--471},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2004},
     doi = {10.4310/HHA.2004.v6.n1.a22},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.2004.v6.n1.a22/}
}