Per anno

 @inproceedings{lprobot-pap94,
    author = {Denti, Enrico and Natali, Antonio and Omicini, Andrea and Zanichelli, Francesco},
    booktitle = {2nd International Conference on the Practical Applications of Prolog (PAP'94)},
    editor = {Sterling, Leon},
    location = {London, UK},
    month = {26--29}}},
    year = 1994
} 

 @inproceedings{lpse-iclp94,
    author = {Denti, Enrico and Omicini, Andrea},
    booktitle = {ICLP'94 Post-Conference Workshop on Applications of Logic Programming to Software Engineering},
    editor = {Ciancarini, Paolo and Sterling, Leon},
    location = {S. Margherita Ligure, GE, Italy},
    month = {18}}},
    title = {Open Logic Theory Composition in a Software Engineering Perspective},
    year = 1994
}