@article{SF_1988__37_1_134920,
     author = {A.V. Kelarev},
     title = {A simple matrix semigroup which is not completely simple.},
     journal = {Semigroup forum},
     pages = {123--126},
     publisher = {mathdoc},
     volume = {37},
     number = {1},
     year = {1988},
     zbl = {0639.20044},
     url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134920/}
}