@article{10_4064_cm_50_2_281_288,
     author = {A. K. Layek},
     title = {On sectorial qualitative cluster sets and directional qualitative cluster sets},
     journal = {Colloquium Mathematicum},
     pages = {281--288},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1985},
     doi = {10.4064/cm-50-2-281-288},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-50-2-281-288/}
}