Take a look back and help us build our collection of classic papers. These are the studies that broke new ground and set the field off in new directions. Over the next year, we'll be working to fill out this section, and we welcome your suggestions. We started the list with Melzack and Wall, 1965 but there are many others. Which of your colleagues' papers do you cite again and again? Please send your nominations for the 'Classic' status to the PRF Papers team.