@article{10.30755/NSJOM.05333,
     author = {Laddawan Lohapan and J\"org Koppitz},
     title = {Regular semigroups of partial transformations preserving a fence {N}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {77 - 91},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {2017},
     doi = {10.30755/NSJOM.05333},
     url = {http://geodesic.mathdoc.fr/articles/10.30755/NSJOM.05333/}
}