@article{MABA_2005_19_3-4_a12,
     author = {Kalcho Todorov and Ilinka Dimitrova},
     title = {On {Some} {Maximal} {Subsemigroups} of the {Symmetric} {Semigroup}},
     journal = {Mathematica balkanica},
     pages = {427},
     publisher = {mathdoc},
     volume = {19},
     number = {3-4},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/MABA_2005_19_3-4_a12/}
}