Per Sort

 @book{appscimas-book2020,
    booktitle = {Multi-Agent Systems 2019},
    doi = {10.3390/books978-3-03943-047-5},
    editor = {Omicini, Andrea and Mariani, Stefano},
    eisbn = {978-3-03943-047-5},
    iris = {11585/786755},
    isbn = {978-3-03943-046-8},
    month = sep,
    publisher = {MDPI},
    title = {Multi-Agent Systems 2019},
    url = {https://www.mdpi.com/books/pdfview/book/2828},
    urlpdf = {https://www.mdpi.com/books/pdfdownload/book/2828},
    year = 2020
} 

 @book{appscimas-book2019,
    booktitle = {Multi-Agent Systems},
    doi = {10.3390/books978-3-03897-925-8},
    editor = {Botti, Vicent and Omicini, Andrea and Mariani, Stefano and Julian, Vicente},
    eisbn = {978-3-03897-925-8},
    iris = {11585/786765},
    isbn = {978-3-03897-924-1},
    month = may,
    pages = {392},
    publisher = {MDPI},
    title = {Multi-Agent Systems},
    url = {https://www.mdpi.com/books/pdfview/book/1303},
    urlpdf = {https://www.mdpi.com/books/pdfdownload/book/1303},
    year = 2019
}