@article{10_37236_11004,
     author = {David Ellis and Maria-Romina Ivan and Imre  Leader},
     title = {Small sets in union-closed families},
     journal = {The electronic journal of combinatorics},
     year = {2023},
     volume = {30},
     number = {1},
     doi = {10.37236/11004},
     zbl = {1506.05204},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/11004/}
}