@article{SF_1976__13_134198,
     author = {H. J. Weinert},
     title = {On semigroups of left inner type.},
     journal = {Semigroup forum},
     pages = {85--91},
     publisher = {mathdoc},
     volume = {13},
     year = {1976},
     zbl = {0326.20053},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134198/}
}