@article{SF_1979__18_134338,
     author = {S. Nakajima},
     title = {On the kernel of the wreath product of completely simple semigroups.},
     journal = {Semigroup forum},
     pages = {21--26},
     publisher = {mathdoc},
     volume = {18},
     year = {1979},
     zbl = {0415.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__18_134338/}
}