@article{SF_1974__6_133959,
     author = {A.V. Mikhalev and U. Knauer},
     title = {Endomorphism monoids of acts over monoids.},
     journal = {Semigroup forum},
     pages = {50--58},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     zbl = {0258.20059},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133959/}
}