@book { FromGradingtoClassification,
    title = "From Grading to Classification",
    author = "Guoqing {Xu}",
    year = "2023",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/b19539",
    url = "https://www.peterlang.com/document/1294499"
}