Per Sort

 @proceedings{proceedings-woa2021,
    address = {Aachen, Germany},
    booktitle = {WOA 2021 -- 22nd Workshop ``From Objects to Agents''},
    dblp = {conf/woa/2021},
    editor = {Calegari, Roberta and Ciatto, Giovanni and Denti, Enrico and Omicini, Andrea and Sartor, Giovanni},
    iris = {11585/834360},
    issn = {1613-0073},
    location = {Bologna, Italy},
    month = oct,
    note = {22nd Workshop ``From Objects to Agents'' (WOA 2021), Bologna, Italy, 1--3~} # sep # {~2021. Proceedings},
    pages = {II, 258},
    publisher = {Sun SITE Central Europe, RWTH Aachen University},
    series = {CEUR Workshop Proceedings},
    subseries = {AI*IA Series},
    title = {From Objects to Agents},
    url = {http://ceur-ws.org/Vol-2963/},
    volume = 2963,
    year = 2021
} 

 @proceedings{proceedings-woa2020,
    address = {Aachen, Germany},
    booktitle = {WOA 2020 -- 21st Workshop ``From Objects to Agents''},
    dblp = {conf/woa/2020},
    editor = {Calegari, Roberta and Ciatto, Giovanni and Denti, Enrico and Omicini, Andrea and Sartor, Giovanni},
    iris = {11585/781511},
    issn = {1613-0073},
    location = {Bologna, Italy},
    month = oct,
    note = {21st Workshop ``From Objects to Agents'' (WOA 2020), Bologna, Italy, 14--16~} # sep # {~2020. Proceedings},
    pages = {VII, 251},
    publisher = {Sun SITE Central Europe, RWTH Aachen University},
    series = {CEUR Workshop Proceedings},
    subseries = {AI*IA Series},
    title = {From Objects to Agents},
    url = {http://ceur-ws.org/Vol-2706/},
    urlpdf = {http://apice.unibo.it/xwiki/bin/download/Publications/ProceedingsWoa2020/ProceedingsWOA2020.pdf},
    volume = 2706,
    year = 2020
}