@article{PIM_1985_N_S_38_52_a10,
     author = {Sin-Min Lee},
     title = {On {Finite-element} {Simple} {Extensions} of a {Countable} {Collection} of {Countable} {Groupoids}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {65 },
     publisher = {mathdoc},
     volume = {_N_S_38},
     number = {52},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1985_N_S_38_52_a10/}
}