Generally, papers are published in conference proceedings or journals. Just look it up on Google and you will find the publication it belongs to, with the date:

Generally, papers are published in conference proceedings or journals. Just look it up on Google and you will find the publication it belongs to, with the date: Volume 40 Issue 1, January 2010 https://dl.acm.org/citation.cfm?id=1672313 https://dl.acm.org/citation.cfm?id=1672313