Per anno

@article{siagents-ieeecn6,
   booktitle = {Special Issue on Software Agents},
   editor = {Ganzha, Maria and Paprzycki, Marcin and Omicini, Andrea},
   journal = {Computing Now},
   month = nov,
   number = 11,
   publisher = {IEEE Computer Society},
   title = {Special Issue on Software Agents},
   url = {https://www.computer.org/publications/tech-news/computing-now/software-agents-twenty-years-and-counting},
   volume = 6,
   year = 2013
}

@article{agents-ieeecn6,
   author = {Ganzha, Maria and Paprzycki, Marcin and Omicini, Andrea},
   journal = {Computing Now},
   month = nov,
   number = 11,
   publisher = {IEEE Computer Society},
   title = {Software Agents: Twenty Years and Counting},
   url = {https://www.computer.org/publications/tech-news/computing-now/software-agents-twenty-years-and-counting},
   volume = 6,
   year = 2013
}