@article{onsetsmathhorizons,
    type = "article",
    author = "Peter Rowlett",
    year = "2023",
    title = {On-Sets: A Vintage Set Theory Game},
    journal = "Math Horizons",
    volume = "30",
    number = "4",
    pages = "8-11",
    publisher = "Mathematical Association of America",
    url = "https://www.tandfonline.com/doi/full/10.1080/10724117.2023.2168404"
}