@article{NSJOM_2008_38_1a_10,
     author = {D. Ma\v{s}ulovi\'c},
     title = {On endomorphism monoids of partial

 orders and central relations},
     journal = {Novi Sad Journal of Mathematics},
     pages = {111-125},
     publisher = {mathdoc},
     volume = {38},
     number = {1},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2008_38_1a_10/}
}