@article{SF_1994__49_2_135331,
     author = {Z. Liu},
     title = {Characterization of monoids by condition {(P)} of cyclic left acts.},
     journal = {Semigroup forum},
     pages = {31--40},
     year = {1994},
     volume = {49},
     number = {2},
     zbl = {0804.20048},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135331/}
}