@article{SEMR_2009_6_a23,
     author = {V. K. Bhat and Neetu Kumari},
     title = {A~note on $\sigma(*)$-rings and their extensions},
     journal = {Sibirskie \`elektronnye matemati\v{c}eskie izvesti\^a},
     pages = {505--509},
     publisher = {mathdoc},
     volume = {6},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SEMR_2009_6_a23/}
}