@article{10_4153_CMB_1994_001_9,
     author = {Ad\'amek, J.},
     title = {Existence and {Nonexistence} of {Regular} {Generators}},
     journal = {Canadian mathematical bulletin},
     pages = {3--7},
     year = {1994},
     volume = {37},
     number = {1},
     doi = {10.4153/CMB-1994-001-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1994-001-9/}
}