@article{10_37236_8250,
     author = {Toufik Mansour},
     title = {The perimeter and site-perimeter of set partitions},
     journal = {The electronic journal of combinatorics},
     year = {2019},
     volume = {26},
     number = {2},
     doi = {10.37236/8250},
     zbl = {1414.05039},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/8250/}
}