@book { OnPropertyandOwnershipRelations,
    title = "On Property and Ownership Relations",
    author = "Wiesław {Gumuła}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06321-9",
    url = "https://www.peterlang.com/document/1049734"
}