@article{ADM_2005_1_a8,
     author = {Vasyl Pyekhtyeryev},
     title = {$\mathcal{H}$--,$\mathcal{R}$-- and $\mathcal{L}$--cross-sections of the infinite symmetric inverse semigroup $IS_X$},
     journal = {Algebra and discrete mathematics},
     pages = {92--104},
     publisher = {mathdoc},
     number = {1},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ADM_2005_1_a8/}
}