@article{NSJOM_2013_43_2a_17,
     author = {Nitima Chaisansuk, and Sorasak Leeratanavalee},
     title = {Some properties
 on the powers of $n$-ary relational systems},
     journal = {Novi Sad Journal of Mathematics},
     pages = {191-199},
     publisher = {mathdoc},
     volume = {43},
     number = {2},
     year = {2013},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2013_43_2a_17/}
}