@article{SF_1979__18_134334,
     author = {C.J. Ash},
     title = {A uniform chain whose inverse semigroup has no chart.},
     journal = {Semigroup forum},
     pages = {1--4},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0419.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134334/}
}