@article{10_4153_CJM_1973_023_0,
     author = {Mitchell, Barry},
     title = {The {Cohomological} {Dimension} of a {Directed} {Set}},
     journal = {Canadian journal of mathematics},
     pages = {233--238},
     year = {1973},
     volume = {25},
     number = {2},
     doi = {10.4153/CJM-1973-023-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1973-023-0/}
}