@article{SF_1986__33_134823,
     author = {H.J. Weinert and V.N. Dixit and P.K. Singhal},
     title = {On quasi-ideals in contracted semigroups rings.},
     journal = {Semigroup forum},
     pages = {431--440},
     publisher = {mathdoc},
     volume = {33},
     year = {1986},
     zbl = {0584.20060},
     url = {http://geodesic.mathdoc.fr/item/SF_1986__33_134823/}
}