@article{10_37236_9582,
     author = {Micha{\l} Przykucki and Thomas Shelton},
     title = {Smallest percolating sets in bootstrap percolation on grids},
     journal = {The electronic journal of combinatorics},
     year = {2020},
     volume = {27},
     number = {4},
     doi = {10.37236/9582},
     zbl = {1456.60264},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/9582/}
}