Per anno

 @incollection{ctxlp-elpIII,
    acm = {736334},
    author = {Denti, Enrico and Lamma, Evelina and Mello, Paola and Natali, Antonio and Omicini, Andrea},
    booktitle = {Extensions of Logic Programming},
    dblp = {conf/elp/DentiLMNO92},
    doi = {10.1007/3-540-56454-3_17},
    editor = {Lamma, Evelina and Mello, Paola},
    eisbn = {978-3-540-47562-0},
    isbn = {978-3-540-56454-6},
    isbn-10 = {3-540-56454-3},
    isbn10 = {3-540-56454-3},
    issn = {0302-9743},
    keywords = {Virtual Machine, Logic Program, Logic Programming, Hypothetical Reasoning, Program Clause},
    note = {3rd International Workshop (ELP'92), Bologna, Italy, 26--28~} # feb # {~1992. Proceedings},
    pages = {339--358},
    publisher = {Springer},
    scopus = {2-s2.0-85028860344},
    series = {Lecture Notes in Computer Science},
    subseries = {Lecture Notes in Artificial Intelligence},
    title = {Techniques for Implementing Contexts in {L}ogic {P}rogramming},
    url = {http://link.springer.com/10.1007/3-540-56454-3_17},
    volume = 660,
    year = 1993
}