@article{SF_1971__2_133837,
     author = {J. Klasa},
     title = {Semisimplicity and von {Neumann's} regularity.},
     journal = {Semigroup forum},
     pages = {354--361},
     publisher = {mathdoc},
     volume = {2},
     year = {1971},
     zbl = {0233.18003},
     url = {http://geodesic.mathdoc.fr/item/SF_1971__2_133837/}
}