@book{
    mue:mel:21:ed,
    editor = "Müller, Stefan and Melnik, Nurit",
    url = "https://proceedings.hpsg.xyz/",
    booktitle = "Proceedings of the {HPSG\,2021} Conference",
    title = "Proceedings of the {HPSG\,2021} Conference",
    year = "2021"
}