@article{10_4064_fm_79_2_159_171,
     author = {S. Mukhopadhyay},
     title = {On essential cluster sets},
     journal = {Fundamenta Mathematicae},
     pages = {159--171},
     publisher = {mathdoc},
     volume = {79},
     number = {2},
     year = {1973},
     doi = {10.4064/fm-79-2-159-171},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-79-2-159-171/}
}